NIVEN NUMBER
import java.util.*;
class Niven_number
{
public static void main(String args[])
{
Scanner s=new Scanner(System.in);
int num,sum=0,d,p;
System.out.println("Enter a number");
num=s.nextInt();
p=num;
while(num!=0)
{
d=num%10;
sum+=d;
num/=10;
}
if(p%sum==0)
System.out.println("Niven number");
else
System.out.println("Not a Niven number");
}
}