can anyone explain what is niven number in java

Answer 1

A niven or harshad number is a number which is divisible by the sum of its digits.

e.g. 12
sum of digits is 3 (1+2) and 12 is divisible by 3 -> 12 is a niven number

n%10 gives you the last digit of a number. n/10 removes the last digit.

So you could use a while loop to calculate the sum of digits.

Checking for divisibility:
if (number % sum == 0){
...
}

Hope this helps.