Divisor 19429

To determine if any number is divisible by 19429, apply the "Wagyx Test":

1. If your number ("X") has 9 digits or more, separate the last (smallest) 8 digits from the rest. This makes two smaller numbers, call them L^eft and R^ight (note: don't add in trailing zeros to L). If there are fewer than 9 digits, L = 0 and therefore R = X.
2. Multiply L by 1063 and subtract this from R.
3. Take that result and cross off its final digit (units). Take this new number and add 1943 times the digit you just crossed off. Call this final result "Y".
4. Y will be much smaller than X, but we have preserved divisibility by 19429. That is, your original number is divisible by 19429 if (and only if) Y is. Now that it's much smaller, with basic knowledge of your 19429-times tables, it should be easy to visually see if Y is divisible by 19429. If the Y is still much larger than 19429, the above process can be repeated until it does reduce to within small multiples of 19429.

Easy!