Divisor 23979

To determine if any number is divisible by 23979, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 7993 - then it is divisible by 23979.

The following tests must pass:

• Test if a number is divisible by 3
• The "Paul Test" for Divisibility by 7993

Easy!