diff --git a/app/helpers/notifications_helper.rb b/app/helpers/notifications_helper.rb
index f09153cff..029c328bb 100644
--- a/app/helpers/notifications_helper.rb
+++ b/app/helpers/notifications_helper.rb
@@ -86,6 +86,6 @@ module NotificationsHelper
     end
 
     def card_notification_title(card)
-      card.title.presence || "Card #{card.id}"
+      card.title.presence || "Card #{card.number}"
     end
 end
diff --git a/app/models/comment/promptable.rb b/app/models/comment/promptable.rb
index 10b49c247..80488f76a 100644
--- a/app/models/comment/promptable.rb
+++ b/app/models/comment/promptable.rb
@@ -16,7 +16,7 @@ module Comment::Promptable
         #### Metadata
 
         * Id: #{id}
-        * Card id: #{card.id}
+        * Card id: #{card.number}
         * Card title: #{card.title}
         * Created by: #{creator.name}}
         * Created at: #{created_at}}
diff --git a/app/models/notification_pusher.rb b/app/models/notification_pusher.rb
index d018c30a6..acb5603a1 100644
--- a/app/models/notification_pusher.rb
+++ b/app/models/notification_pusher.rb
@@ -102,7 +102,7 @@ class NotificationPusher
     end
 
     def card_notification_title(card)
-      card.title.presence || "Card #{card.id}"
+      card.title.presence || "Card #{card.number}"
     end
 
     def comment_notification_body(event)
diff --git a/app/views/mailers/notification/bundle_mailer/notification.html.erb b/app/views/mailers/notification/bundle_mailer/notification.html.erb
index 956baea91..616e49a8c 100644
--- a/app/views/mailers/notification/bundle_mailer/notification.html.erb
+++ b/app/views/mailers/notification/bundle_mailer/notification.html.erb
@@ -5,7 +5,7 @@
 
     <% @notifications.group_by(&:card).each do |card, notifications| %>
       <h2 class="notification__board"><%= card.board.name %></h2>
-      <%= link_to "##{ card.id } #{ card.title }", card, class: "card__title" %>
+      <%= link_to "##{ card.number } #{ card.title }", card, class: "card__title" %>
       <%= render partial: "notification/bundle_mailer/notification", collection: notifications, as: :notification %>
     <% end %>
 
diff --git a/app/views/mailers/notification/bundle_mailer/notification.text.erb b/app/views/mailers/notification/bundle_mailer/notification.text.erb
index 9ea24e60b..0cd720f94 100644
--- a/app/views/mailers/notification/bundle_mailer/notification.text.erb
+++ b/app/views/mailers/notification/bundle_mailer/notification.text.erb
@@ -5,7 +5,7 @@ You have <%= pluralize @notifications.count, "new notification" %>.
 --------------------------------------------------------------------------------
 
 <%= card.board.name %>
-<%= "##{ card.id } #{ card.title }" %>
+<%= "##{ card.number } #{ card.title }" %>
 
 --------------------------------------------------------------------------------
 
diff --git a/app/views/notifications/notification/_header.html.erb b/app/views/notifications/notification/_header.html.erb
index de3432354..85261284e 100644
--- a/app/views/notifications/notification/_header.html.erb
+++ b/app/views/notifications/notification/_header.html.erb
@@ -2,7 +2,7 @@
   <div class="card__board">
   <span class="card__id">
     <span class="for-screen-reader">Card number</span>
-    <%= notification.card.id %>
+    <%= notification.card.number %>
   </span>
     <span class="card__board-name">
     <span class="overflow-ellipsis"><%= notification.card.board.name %></span>