# Python Program to check if a number is an Armstrong or not

In this tutorial, we will discuss Python program to check if a number is an Armstrong or not.

Before going to the program first, let us understand what is an *Armstrong Number.*

**Armstrong Number:**

- An Armstrong number (also known as a narcissistic number) is a number that is equal to the sum of its digits raised to the power of the number of digits.
- For example, 153 is an Armstrong number because $_{3}+_{3}+_{3}=153$.

**Related:** Python Program for Fibonacci Series

#### Program code for checking if a number is an Armstrong or not in Python

# Armstrong Number Checker in Python def is_armstrong(num): num_str = str(num) num_digits = len(num_str) sum_of_powers = sum([int(digit) ** num_digits for digit in num_str]) return sum_of_powers == num number = int(input("Enter a number: ")) if is_armstrong(number): print(f"{number} is an Armstrong number.") else: print(f"{number} is not an Armstrong number.")

#### Explanation

**Function Definition**: The`is_armstrong`

function takes an integer`num`

as input and returns`True`

if the number is an Armstrong number, and`False`

otherwise.**Sum of Powers**: The function calculates the sum of each digit raised to the power of the number of digits using a list comprehension.**Main Program**: The program prompts the user to enter a number and then checks if it is an Armstrong number using the`is_armstrong`

function.

#### Output

- When you run the above program, it will prompt you to enter a number.
- After entering the number, it will check whether the number is an Armstrong number or not and print the result.

#### Conclusion

- In this tutorial, we learned how to check if a given number is an Armstrong number using a Python program.
- Understanding this concept is essential for solving various mathematical problems and competitive programming challenges.
- Practice this example to enhance your programming skills and understanding of Armstrong numbers.