Question

How to check whether a number is a perfect number in JavaScript

Answer 1

// If the sum of all factors of a number is equal to the number, then the number is perfect

// Factors of a number are numbers that divide the number evenly
   
// 6
// factors = 1, 2, 3
// 1 + 2 + 3 = 6
 
const num = 6;
let sumOfFactors = 0;
   
for (let i = 1; i < num; i++)
     if (num % i == 0)
         sumOfFactors += i;
   
if (sumOfFactors == num)
    console.log("Perfect Number");
else
    console.log("Not a Perfect Number");


  
  
  
/*
run:
  
"Perfect Number"
  
*/

 

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