Python | math.factorial() function Last Updated : 16 Feb, 2023 Comments Improve Suggest changes Like Article Like Report 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 # Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math x = 5 # returning the factorial print ("The factorial of 5 is : ", end ="") print (math.factorial(x)) Output:The factorial of 5 is : 120 Code #2: Python3 # Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math x = 5 y = 15 z = 8 # returning the factorial 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)) 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 # Python code to demonstrate the working of factorial() # importing "math" for mathematical operations import math # when x is not integer print ("math.factorial(13.7) : ", math.factorial(13.7)) Output: ValueError: factorial() only accepts integral values Comment More infoAdvertise with us S Shivam_k Follow Improve Article Tags : Python Python math-library-functions Practice Tags : python Explore Python FundamentalsPython Introduction 3 min read Input and Output in Python 4 min read Python Variables 6 min read Python Operators 5 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 7 min read Python Functions 8 min read Recursion in Python 6 min read Python Lambda Functions 6 min read Python Data StructuresPython String 6 min read Python Lists 6 min read Python Tuples 6 min read Dictionaries in Python 7 min read Python Sets 10 min read Python Arrays 9 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 6 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 2 min read Python MySQL 9 min read Python Packages 12 min read Python Modules 7 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 11 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 6 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library- Tutorial 4 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 7 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 10 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 7 min read Python | Build a REST API using Flask 3 min read How to Create a basic API using Django Rest Framework ? 4 min read Python PracticePython Quiz 3 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like