Divisor 24399

To determine if any number is divisible by 24399, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 9 and 2711 - then it is divisible by 24399.

The following tests must pass:

• Test if a number is divisible by 9
• The "Julian Demuth Test" for Divisibility by 2711

Easy!