krishnamurthy_number.py

"""
 == Krishnamurthy Number ==
It is also known as Peterson Number
A Krishnamurthy Number is a number whose sum of the
factorial of the digits equals to the original
number itself.

For example: 145 = 1! + 4! + 5!
 So, 145 is a Krishnamurthy Number
"""


deffactorial(digit: int) ->int:
"""
 >>> factorial(3)
 6
 >>> factorial(0)
 1
 >>> factorial(5)
 120
 """

return1ifdigitin (0, 1) else (digit*factorial(digit-1))


defkrishnamurthy(number: int) ->bool:
"""
 >>> krishnamurthy(145)
 True
 >>> krishnamurthy(240)
 False
 >>> krishnamurthy(1)
 True
 """

fact_sum=0
duplicate=number
whileduplicate>0:
duplicate, digit=divmod(duplicate, 10)
fact_sum+=factorial(digit)
returnfact_sum==number


if__name__=="__main__":
print("Program to check whether a number is a Krisnamurthy Number or not.")
number=int(input("Enter number: ").strip())
print(
f"{number} is {''ifkrishnamurthy(number) else'not '}a Krishnamurthy Number."
 )