diff --git a/Lib/numbers.py b/Lib/numbers.py
--- a/Lib/numbers.py
+++ b/Lib/numbers.py
@@ -18,7 +18,9 @@
     __slots__ = ()
 
     # Concrete numeric types must provide their own hash implementation
-    __hash__ = None
+    @abstractmethod
+    def __hash__(self):
+        pass
 
 
 ## Notes on Decimal
diff --git a/Lib/test/test_abstract_numbers.py b/Lib/test/test_abstract_numbers.py
--- a/Lib/test/test_abstract_numbers.py
+++ b/Lib/test/test_abstract_numbers.py
@@ -7,6 +7,12 @@
 from test import support
 
 class TestNumbers(unittest.TestCase):
+    def test_instantiation(self):
+        import numbers
+        for name in numbers.__all__:
+            cls = getattr(numbers, name)
+            self.assertRaises(TypeError, cls)
+
     def test_int(self):
         self.assertTrue(issubclass(int, Integral))
         self.assertTrue(issubclass(int, Complex))