Divisor 23939

To determine if any number is divisible by 23939, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 37 and 647 - then it is divisible by 23939.

The following tests must pass:

• Test if a number is divisible by 37
• Test if a number is divisible by 647

Easy!