Disarium Number Program in Java

A number is called Disarium number if the sum of its power of the positions from left to right is equal to the number.

Example:

11 + 32 + 53 = 1 + 9 + 125 = 135

import java.util.Scanner;

public class DisariumNumber
{
    public static void main(String[] args)
    {
        int r, n, num,digits=0,
        sum = 0;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter number=");
        n = sc.nextInt();
        num = n;
        while (num > 0)
        {
            digits++;
            num = num / 10;
        }
        num = n;
        while (num > 0)
        {
            r = num % 10;
            sum = sum + (int)Math.pow(r, digits);
            num = num / 10;
            digits--;
        }        
        
        if(n==sum)
        {
            System.out.println("Disarium Number");
        }
        else
        {
            System.out.println("Not Disarium Number");
        }
        
    }
}

Output:

Enter number=135
Disarium Number