diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/TimestampWithoutTZType.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/TimestampWithoutTZType.scala
index 558f5ee94a..856d5497f7 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/TimestampWithoutTZType.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/TimestampWithoutTZType.scala
@@ -48,6 +48,8 @@ class TimestampWithoutTZType private() extends AtomicType {
    */
   override def defaultSize: Int = 8
 
+  override def typeName: String = "timestamp without time zone"
+
   private[spark] override def asNullable: TimestampWithoutTZType = this
 }
 
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
index c268d52c4f..910c757233 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CastSuite.scala
@@ -1295,6 +1295,19 @@ abstract class AnsiCastSuiteBase extends CastSuiteBase {
       }
     }
   }
+
+  test("disallow type conversions between Numeric types and Timestamp without time zone type") {
+    import DataTypeTestUtils.numericTypes
+    checkInvalidCastFromNumericType(TimestampWithoutTZType)
+    var errorMsg = "cannot cast bigint to timestamp without time zone"
+    verifyCastFailure(cast(Literal(0L), TimestampWithoutTZType), Some(errorMsg))
+
+    val timestampWithoutTZLiteral = Literal.create(LocalDateTime.now(), TimestampWithoutTZType)
+    errorMsg = "cannot cast timestamp without time zone to"
+    numericTypes.foreach { numericType =>
+      verifyCastFailure(cast(timestampWithoutTZLiteral, numericType), Some(errorMsg))
+    }
+  }
 }
 
 /**