Ore Number in Java

Ore number is a positive integer whose divisors have a harmonic value as an integer. Ore number is also known as harmonic divisor number. For example, 6 has four factors: 1, 2, 3 and 6. Harmonic mean of the factors is: 4 / (1 + 1 / 2 + 1 / 3 + 1 / 6) = 2 The harmonic mean of the factors of 6 is 2, which is an integer. So, 6 is an Ore number or harmonic divisor number. Write a program in Java to input an integer and check whether it is an Ore Number or not. 

import java.io.*;

 class Ore

{

 public static void main(String args[])throws IOException

{

 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

 System.out.print("Enter the number: "); 

 int num = Integer.parseInt(br.readLine()); 

 int f = 0;

 double mean = 0.0;

 for(int i = 1; i <= num; i++)

{

 if(num % i == 0)

{

 f++; mean += 1.0 / i;

 }

 }

 mean = f / mean; 

 if(mean == (int)mean) 

 System.out.println(num + " is an Ore Number.");

 else

 System.out.println(num + " is NOT an Ore Number.");

 }

 }