Python Program to Check Armstrong Number – 2025

Hey guys, in this blog we will see a Python Program to Check Armstrong Numbers.

An Armstrong number is simply a number that equals the sum of the cube of all its digits. For example 371, it is an Armstrong number, and the following is the proof.

371 = (3)³ + (7)³ + (1)³
371 = 27 + 343 + 1
371 = 371

Code

# Python program to check if the number is an Armstrong number or not

# take input from the user
num = int(input("Enter a number: "))

# initialize sum
sum = 0

# find the sum of the cube of each digit
temp = num
while temp > 0:
   digit = temp % 10
   sum += digit ** 3
   temp //= 10

# display the result
if num == sum:
   print(num,"is an Armstrong number")
else:
   print(num,"is not an Armstrong number")

Output

Enter a number: 231
231 is not an Armstrong number

Enter a number: 407
407 is an Armstrong number

Enter a number: 371
371 is an Armstrong number

Here we are checking the same condition we defined above about Armstrong Numbers.

In our while loop,

• We are extracting digit by digit
• Cubing it
• Removing the extracted digit from our num
• And adding the cube to our sum

Suppose num = 371
So temp is also 371.
digit = temp%10 = 1
temp = temp//10 = 37

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