Divisor 19439

To determine if any number is divisible by 19439, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 7 and 2777 - then it is divisible by 19439.

The following tests must pass:

• Test if a number is divisible by 7
• The "Mike Pepper Test" for Divisibility by 2777

Easy!