**Contents**show

## How do you code a perfect number in Java?

**Java Program to Check if a given Number is Perfect Number**

- import java.util.Scanner;
- public class Perfect.
- {
- public static void main(String[] args)
- {
- int n, sum = 0;
- Scanner s = new Scanner(System. in);
- System. out. print(“Enter any integer you want to check:”);

## What is perfect or not?

Algorithm to check whether a given number is a perfect number or not. Input the number. Find all divisors of **the number except the number itself**. If the sum of all divisors of the number is equal to the number, then return true.

## How do you know a number is perfect?

A number is perfect if **the sum of its proper factors is equal to the number**. To find the proper factors of a number, write down all numbers that divide the number with the exception of the number itself. If the sum of the factors is equal to 18, then 18 is a perfect number.

## Is 5 an Automorphic number?

An automorphic number is a number whose square ends with the number itself. For example, 5 is an automorphic number, **5*5 =25**. The last digit is 5 which same as the given number. It has only a positive single digit number.

## IS 496 a perfect number?

Perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128.

## What are strong no?

Strong number is **a number whose sum of all digits’ factorial is equal to the number ‘n’**. … So, to find a number whether its strong number, we have to pick every digit of the number like the number is 145 then we have to pick 1, 4 and 5 now we will find factorial of each number i.e, 1!

## Why Is 9 the perfect number?

The number 9 is revered in Hinduism and considered a complete, perfected and divine number because it **represents the end of a cycle in the decimal system**, which originated from the Indian subcontinent as early as 3000 BC. … Nine is a significant number in Norse Mythology.

## What is the biggest perfect number?

The largest perfect number corresponds to the **Mersenne prime 2 ^{6972593} – 1** (a number with over 2 million digits), the perfect number itself has 4197919 digits.

## Why is 12 the perfect number?

Twelve is a sublime number, a number that has a **perfect number of divisors**, and the sum of its divisors is also a perfect number. Since there is a subset of 12’s proper divisors that add up to 12 (all of them but with 4 excluded), 12 is a semiperfect number. … Twelve is also the kissing number in three dimensions.

## What are the first 10 perfect numbers?

It is known that all even perfect numbers (except 6) end in 16, 28, 36, 56, 76, or 96 (Lucas 1891) and have digital root 1. In particular, the last digits of the first few perfect numbers are **6, 8, 6, 8, 6, 6, 8, 8, 6, 6, 8, 8**, 6, 8, 8, …

## Is 4 a perfect square?

The first 12 perfect squares are: {1, **4, 9**, 25, 36, 49, 64, 81, 100, 121, 144…} Perfect squares are used often in math. Try to memorize these familiar numbers so that you can recognize them as they are used in many math problems.