The characteristics of divisible by 3.4.7.9.11

The characteristics of divisible by 3.4.7.9.11

If the sum of numbers of an integer can be divided by 3, then the integer can be divided by 3. If the last two digits of an integer can be divided by 4, then the number can be divided by 4. If the number of digits of an integer is truncated, then 2 times of the number of digits is subtracted from the remaining number. If the difference is 7 times, then the original number can be divided by 7