Strong number checker in python
Strong number program in python | python basic programs | learn python | Codigence
3 min read
What is a Strong number?
A Strong number is a special number whose sum of the all digit factorial should be equal to the number itself.
To find a whether given number is strong or not. We pick each digit from the given number and find its factorial, and we will do this every digit of the number.
Once we get the factorial of all digit, then we do the sum of factorials. If the sum is equal to the given number then the given number is strong otherwise not.
Code 1(Using While Loop):
python
# Variable to store sum of the numbers
sum=0
# Ask user to enter the number
num=int(input("Enter a number:"))
# temporary variable store copy of the original number
dup_no=num
# Using while loop
while(dup_no):
# intialize with 1
i=1
# factorial variable with 1
fact=1
rem=dup_no%10
while(i<=rem):
fact=fact*i # Find factorial of each number
i=i+1
sum=sum+fact
dup_no=dup_no//10
if(sum==num):
print(str(num)+" is a strong number")
else:
print(str(num)+" is not a strong number")
Output:
python
Enter a number:
145
145 is a strong number
Code 2(Using For Loop):
python
# Python Program to find Strong Number
num = int(input(" Enter the Number:"))
sum = 0
dup_no = num
while(dup_no > 0):
fact = 1
rem = dup_no % 10
for i in range(1, rem + 1):
fact = fact * i
print("Factorial of %d = %d" %(rem, fact))
sum = sum + fact
dup_no = dup_no // 10
print("\nSum of Factorials of a Given Number %d = %d" %(num, sum))
if (sum == num):
print("So %d is a Strong Number"%(num))
else:
print("So %d is not a Strong Number"%(num))
Output:
python
Enter the Number:
145
Factorial of 5 = 120
Factorial of 4 = 24
Factorial of 1 = 1
Sum of Factorials of a Given Number 145 = 145
So 145 is a Strong Number
Code 3(Using math library):
python
# using math library
import math
num = int(input(" Enter the Number:"))
sum = 0
dup_no = num
while(dup_no > 0):
rem = dup_no % 10
fact = math.factorial(rem) # Using the buitlt-in factorial function
print("Factorial of %d = %d" %(rem, fact))
sum = sum + fact
dup_no = dup_no // 10
print("\n Sum of Factorials of a Given Number %d = %d" %(num, sum))
if (sum == num):
print(" %d is a Strong Number"%(num))
else:
print(" %d is not a Strong Number"%(num))
Output:
python
Enter the Number:
145
Factorial of 5 = 120
Factorial of 4 = 24
Factorial of 1 = 1
Sum of Factorials of a Given Number 145 = 145
145 is a Strong Number
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