A Python program to check if a given number is a Strong number or not.

A Strong number is a number whose sum of factorials of its digits is equal to the number itself. In other words, if we take each digit of a number, calculate its factorial, and add up all the factorials, and the sum is equal to the original number, then that number is called a Strong number.

For example, 145 is a Strong number because:

1! + 4! + 5! = 1 + 24 + 120 = 145

Some other examples of Strong numbers are: 1, 2, 145, 40585, 871, and 1454.

Here's a Python program to check if a given number is a Strong number or not:

python
# Function to calculate the factorial of a number
def factorial(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * factorial(n-1)

# Function to check if a number is a Strong number
def is_strong(n):
    # Compute the sum of the factorials of the digits
    sum = 0
    temp = n
    while temp > 0:
        digit = temp % 10
        sum += factorial(digit)
        temp //= 10

    # Check if the number is a Strong number
    if n == sum:
        return True
    else:
        return False

# Get the number to check from the user
num = int(input("Enter a number: "))

# Check if the number is a Strong number
if is_strong(num):
    print(num, "is a Strong number")
else:
    print(num, "is not a Strong number")

In this program, I first define a function factorial() to calculate the factorial of a number. This function takes a number n as input and returns its factorial.

I then define a function is_strong() to check if a number is a Strong number or not. To do this, I compute the sum of the factorials of the digits in the number. I extract each digit using the modulus operator (%), compute its factorial using the factorial() function, and add it to a running sum. Finally, I check if the sum is equal to the original number, and return True if it is, or False otherwise.

I then ask the user to enter a number to check. I call the is_strong() function on the number, and print a message indicating whether it's a Strong number or not based on the function's return value.