List of deficient numbers – Java Program to Check Deficient Number

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List of deficient numbers: In the previous article, we have discussed Java program to Check Abundant Number

In this article we are going to understand what Deficient number is and how we can check whether a number is Deficient or not in Java with examples.

Program to Check Deficient Number

Deficient numbers are numbers whose sum of all proper divisors is less than the number.

 Example :

Deficient Number

15: Divisors- 1,3,5;                 Sum = 1+3+5 = 9<15 

Not a Deficient Number

12: Divisors- 1,2,3,4,6;            Sum = 1+2+3+4+6 = 16>12
40: Divisors- 1,2,4,5,8,10,20;   Sum = 1+2+4+5+8+10+20 = 50>40

In the above examples the numbers 40 ad 15 are Deficient numbers as sum of their divisors are lesser than the number itself. Hence 12 is not a Deficient number.

Let’s see different ways to check deficient number.

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Approach :

  1. Enter/declare a number and store it .
  2. Then we find the divisors of the number ad add them up.
  3. If the resultant sum is greater than the number itself, then the number is said to be a Deficient number.

Method-1: Java Program to Check Deficient Number By Using Static Value

import java.util.Scanner;
public class DeficientNumber{
    public static void main(String args[])
    {
        //A number declared
        int num = 15;

        int sum = 0;
        // Loop to find the divisors as well as add them up
        for(int i = 1; i<num; i++)
            if(num%i==0)
                sum+=i;
        
        if(sum<num)
        {
            System.out.println(num+" is a Deficient number");
        }
        else
        {
            System.out.println(num+" is Not a Deficient number");
        }
    }
}

Output:

15 is a Deficient number

Method-2: Java Program to Check Deficient Number By User Input Value

import java.util.*;

public class DeficientNumber
{
    public static void main(String args[])
    {
        //Taking the number as input from the user using scaner class
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a number : ");
        int num = scan.nextInt();

        int sum = 0;
        // Loop to find the divisors as well as add them up
        for(int i = 1; i<num; i++)
            if(num%i==0)
                sum+=i;
        
        if(sum<num)
        {
            System.out.println(num+" is a Deficient number");
        }
        else
        {
            System.out.println(num+" is Not a Deficient number");
        }
    }
}


Output:

Enter a number : 15
15 is a Deficient number

Method-3: Java Program to Check Deficient Number By User Defined Method

import java.util.*;

public class DeficientNumber
{
    public static void main(String args[])
    {
        //Taking the number as input from the user using scaner class
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a number : ");
        int num = scan.nextInt();
        
        //Calling checkNumber() method to check Deficient number
        checkNumber(num);
    }    
    
    
    public static void checkNumber(int num)
    {
        int sum = 0;
        // Loop to find the divisors as well as add them up
        for(int i = 1; i<num; i++)
            if(num%i==0)
                sum+=i;
        
        if(sum<num)
        {
            System.out.println(num+" is a Deficient number");
        }
        else
        {
            System.out.println(num+" is Not a Deficient number");
        }
    }
}


Output:

Enter a number : 15
15 is a Deficient number

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