Question

Check the divisibility of $406839$ by $9$.

Answer 1

According to the divisibility by $9$:

A number is divisible by $9$, if the sum of its digits is divisible by $9$.

For example:

Consider the number $57384$

sum of digits $=5+7+3+8+4=27$, which is divisible by $9$. Therefore, the number $57384$ is divisible by $9$.

Now, we have $406839$,

the sum of digits of the number $406839$ $=4+0+6+8+3+9=30$,which is not divisible by $9$.

Thus, $406839$ is not divisible by $9$.