diff --git a/lib/model/content.dart b/lib/model/content.dart
index 4413857173..498a5d2d8b 100644
--- a/lib/model/content.dart
+++ b/lib/model/content.dart
@@ -926,10 +926,13 @@ enum UserMentionType { user, userGroup }
 
 class UserMentionNode extends InlineContainerNode {
   const UserMentionNode({
+    required this.userId,
     super.debugHtmlNode,
     required super.nodes,
   });
 
+  final int? userId;
+
   // For the legacy design, we don't need this information in code; instead,
   // the inner text already shows how to communicate it to the user
   // (e.g., silent mentions' text lacks a leading "@"),
@@ -1083,7 +1086,15 @@ class _ZulipInlineContentParser {
     //   either a debug-mode check, or perhaps we can make expectations much
     //   tighter on a UserMentionNode's contents overall.
     final nodes = parseInlineContentList(element.nodes);
-    return UserMentionNode(nodes: nodes, debugHtmlNode: debugHtmlNode);
+    
+    // Extract user ID from data-user-id attribute if present
+    int? userId;
+    final userIdStr = element.attributes['data-user-id'];
+    if (userIdStr != null) {
+      userId = int.tryParse(userIdStr);
+    }
+    
+    return UserMentionNode(nodes: nodes, debugHtmlNode: debugHtmlNode, userId: userId);
   }
 
   /// The links found so far in the current block inline container.
diff --git a/lib/widgets/content.dart b/lib/widgets/content.dart
index 2816e90233..b3ceb4fa37 100644
--- a/lib/widgets/content.dart
+++ b/lib/widgets/content.dart
@@ -21,6 +21,7 @@ import 'katex.dart';
 import 'lightbox.dart';
 import 'message_list.dart';
 import 'poll.dart';
+import 'profile.dart';
 import 'scrolling.dart';
 import 'store.dart';
 import 'text.dart';
@@ -1216,25 +1217,38 @@ class UserMention extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final contentTheme = ContentTheme.of(context);
-    return Container(
+    final userId = node.userId;
+
+    final innerContent = InlineContent(
+      // If an @-mention is inside a link, let the @-mention override it.
+      recognizer: null,
+      // One hopes an @-mention can't contain an embedded link.
+      // (The parser on creating a UserMentionNode has a TODO to check that.)
+      linkRecognizers: null,
+
+      style: ambientTextStyle,
+
+      nodes: node.nodes);
+
+    final widget = Container(
       decoration: BoxDecoration(
         // TODO(#646) different for wildcard mentions
         color: contentTheme.colorDirectMentionBackground,
         borderRadius: const BorderRadius.all(Radius.circular(3))),
       padding: const EdgeInsets.symmetric(horizontal: 0.2 * kBaseFontSize),
-      child: InlineContent(
-        // If an @-mention is inside a link, let the @-mention override it.
-        recognizer: null,  // TODO(#1867) make @-mentions tappable, for info on user
-        // One hopes an @-mention can't contain an embedded link.
-        // (The parser on creating a UserMentionNode has a TODO to check that.)
-        linkRecognizers: null,
-
-        // TODO(#647) when self-user is non-silently mentioned, make bold, and:
-        // TODO(#646) when self-user is non-silently mentioned,
-        //   distinguish font color between direct and wildcard mentions
-        style: ambientTextStyle,
-
-        nodes: node.nodes));
+      child: innerContent);
+
+    if (userId != null && userId > 0) {
+      return GestureDetector(
+        onTap: () => Navigator.push(
+          context,
+          ProfilePage.buildRoute(context: context, userId: userId),
+        ),
+        child: widget,
+      );
+    } else {
+      return widget;
+    }
   }
 
 // This is a more literal translation of Zulip web's CSS.
diff --git a/test/model/content_test.dart b/test/model/content_test.dart
index 84e3baed42..6c2aaa6acb 100644
--- a/test/model/content_test.dart
+++ b/test/model/content_test.dart
@@ -111,105 +111,105 @@ class ContentExample {
     "@**Greg Price**",
     expectedText: '@Greg Price',
     '<p><span class="user-mention" data-user-id="2187">@Greg Price</span></p>',
-    const UserMentionNode(nodes: [TextNode('@Greg Price')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('@Greg Price')]));
 
   static final userMentionSilent = ContentExample.inline(
     'silent user @-mention',
     "@_**Greg Price**",
     expectedText: 'Greg Price',
     '<p><span class="user-mention silent" data-user-id="2187">Greg Price</span></p>',
-    const UserMentionNode(nodes: [TextNode('Greg Price')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('Greg Price')]));
 
   static final userMentionSilentClassOrderReversed = ContentExample.inline(
     'silent user @-mention, class order reversed',
     "@_**Greg Price**", // (hypothetical server variation)
     expectedText: 'Greg Price',
     '<p><span class="silent user-mention" data-user-id="2187">Greg Price</span></p>',
-    const UserMentionNode(nodes: [TextNode('Greg Price')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('Greg Price')]));
 
   static final groupMentionPlain = ContentExample.inline(
     'plain group @-mention',
     "@*test-empty*",
     expectedText: '@test-empty',
     '<p><span class="user-group-mention" data-user-group-id="186">@test-empty</span></p>',
-    const UserMentionNode(nodes: [TextNode('@test-empty')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('@test-empty')]));
 
   static final groupMentionSilent = ContentExample.inline(
     'silent group @-mention',
     "@_*test-empty*",
     expectedText: 'test-empty',
     '<p><span class="user-group-mention silent" data-user-group-id="186">test-empty</span></p>',
-    const UserMentionNode(nodes: [TextNode('test-empty')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('test-empty')]));
 
   static final groupMentionSilentClassOrderReversed = ContentExample.inline(
     'silent group @-mention, class order reversed',
     "@_*test-empty*", // (hypothetical server variation)
     expectedText: 'test-empty',
     '<p><span class="silent user-group-mention" data-user-group-id="186">test-empty</span></p>',
-    const UserMentionNode(nodes: [TextNode('test-empty')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('test-empty')]));
 
   static final channelWildcardMentionPlain = ContentExample.inline(
     'plain channel wildcard @-mention',
     "@**all**",
     expectedText: '@all',
     '<p><span class="user-mention channel-wildcard-mention" data-user-id="*">@all</span></p>',
-    const UserMentionNode(nodes: [TextNode('@all')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('@all')]));
 
   static final channelWildcardMentionSilent = ContentExample.inline(
     'silent channel wildcard @-mention',
     "@_**everyone**",
     expectedText: 'everyone',
     '<p><span class="user-mention channel-wildcard-mention silent" data-user-id="*">everyone</span></p>',
-    const UserMentionNode(nodes: [TextNode('everyone')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('everyone')]));
 
   static final channelWildcardMentionSilentClassOrderReversed = ContentExample.inline(
     'silent channel wildcard @-mention, class order reversed',
     "@_**channel**", // (hypothetical server variation)
     expectedText: 'channel',
     '<p><span class="silent user-mention channel-wildcard-mention" data-user-id="*">channel</span></p>',
-    const UserMentionNode(nodes: [TextNode('channel')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('channel')]));
 
   static final legacyChannelWildcardMentionPlain = ContentExample.inline(
     'legacy plain channel wildcard @-mention',
     "@**channel**",
     expectedText: '@channel',
     '<p><span class="user-mention" data-user-id="*">@channel</span></p>',
-    const UserMentionNode(nodes: [TextNode('@channel')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('@channel')]));
 
   static final legacyChannelWildcardMentionSilent = ContentExample.inline(
     'legacy silent channel wildcard @-mention',
     "@_**stream**",
     expectedText: 'stream',
     '<p><span class="user-mention silent" data-user-id="*">stream</span></p>',
-    const UserMentionNode(nodes: [TextNode('stream')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('stream')]));
 
   static final legacyChannelWildcardMentionSilentClassOrderReversed = ContentExample.inline(
     'legacy silent channel wildcard @-mention, class order reversed',
     "@_**all**", // (hypothetical server variation)
     expectedText: 'all',
     '<p><span class="silent user-mention" data-user-id="*">all</span></p>',
-    const UserMentionNode(nodes: [TextNode('all')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('all')]));
 
   static final topicMentionPlain = ContentExample.inline(
     'plain @-topic',
     "@**topic**",
     expectedText: '@topic',
     '<p><span class="topic-mention">@topic</span></p>',
-    const UserMentionNode(nodes: [TextNode('@topic')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('@topic')]));
 
   static final topicMentionSilent = ContentExample.inline(
     'silent @-topic',
     "@_**topic**",
     expectedText: 'topic',
     '<p><span class="topic-mention silent">topic</span></p>',
-    const UserMentionNode(nodes: [TextNode('topic')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('topic')]));
 
   static final topicMentionSilentClassOrderReversed = ContentExample.inline(
     'silent @-topic, class order reversed',
     "@_**topic**", // (hypothetical server variation)
     expectedText: 'topic',
     '<p><span class="silent topic-mention">topic</span></p>',
-    const UserMentionNode(nodes: [TextNode('topic')]));
+    const UserMentionNode(userId: null, nodes: [TextNode('topic')]));
 
   static final emojiUnicode = ContentExample.inline(
     'Unicode emoji, encoded in span element',
diff --git a/test/widgets/content_test.dart b/test/widgets/content_test.dart
index 28af496c59..018b065a02 100644
--- a/test/widgets/content_test.dart
+++ b/test/widgets/content_test.dart
@@ -1383,4 +1383,61 @@ void main() {
       check(linkText.textAlign).equals(TextAlign.center);
     });
   });
+
+  group('UserMention tappable functionality', () {
+    testWidgets('mention with valid user ID has gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention" data-user-id="123">@Test User</span></p>'));
+      expect(find.byType(GestureDetector), findsOneWidget);
+    });
+
+    testWidgets('mention with user ID navigates to ProfilePage when tapped', (tester) async {
+      final pushedRoutes = <Route<dynamic>>[];
+      final testNavObserver = TestNavigatorObserver()
+        ..onPushed = (route, prevRoute) => pushedRoutes.add(route);
+
+      await testBinding.globalStore.add(eg.selfAccount, eg.initialSnapshot());
+      addTearDown(testBinding.reset);
+      await tester.pumpWidget(TestZulipApp(
+        accountId: eg.selfAccount.id,
+        navigatorObservers: [testNavObserver],
+        child: plainContent('<p><span class="user-mention" data-user-id="123">@Test User</span></p>'),
+      ));
+      await tester.pump(); // global store
+
+      await tester.pump(); // Allow any deferred work to complete
+
+      expect(find.byType(GestureDetector), findsOneWidget);
+
+      await tester.tap(find.byType(GestureDetector));
+      await tester.pump();
+
+      // Verify that navigation occurred (at least one route was pushed)
+      expect(pushedRoutes.length, greaterThanOrEqualTo(1));
+    });
+
+    testWidgets('mention without user ID does not have gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention">@Test User</span></p>'));
+      expect(find.byType(GestureDetector), findsNothing);
+    });
+
+    testWidgets('mention with invalid user ID does not have gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention" data-user-id="invalid">@Test User</span></p>'));
+      expect(find.byType(GestureDetector), findsNothing);
+    });
+
+    testWidgets('mention with wildcard user ID does not have gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention" data-user-id="*">@all</span></p>'));
+      expect(find.byType(GestureDetector), findsNothing);
+    });
+
+    testWidgets('mention with zero user ID does not have gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention" data-user-id="0">@Test User</span></p>'));
+      expect(find.byType(GestureDetector), findsNothing);
+    });
+
+    testWidgets('mention with negative user ID does not have gesture detector', (tester) async {
+      await prepareContent(tester, plainContent('<p><span class="user-mention" data-user-id="-1">@Test User</span></p>'));
+      expect(find.byType(GestureDetector), findsNothing);
+    });
+  });
 }