Python | math.factorial() function
Last Updated :
16 Feb, 2023
In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. math.factorial() function returns the factorial of desired number.
Syntax: math.factorial(x)
Parameter:
x: This is a numeric expression.
Returns: factorial of desired number.
Time Complexity: O(n) where n is the input number.
Auxiliary space: O(1)
Code #1:
Python3
import math
x = 5
print ("The factorial of 5 is : ", end ="")
print (math.factorial(x))
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Output:
The factorial of 5 is : 120
Code #2:
Python3
import math
x = 5
y = 15
z = 8
print ("The factorial of 5 is : ", math.factorial(x))
print ("The factorial of 15 is : ", math.factorial(y))
print ("The factorial of 8 is : ", math.factorial(z))
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Output:
The factorial of 5 is : 120
The factorial of 15 is : 1307674368000
The factorial of 8 is : 40320
Code #3: Throws ValueError if x is not integer
Python3
import math
print ("math.factorial(13.7) : ", math.factorial(13.7))
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Output:
ValueError: factorial() only accepts integral values
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