# How to Find the Factorial of an integer with NumPy in Python

A factorial of an integer is the result of multiplying all the integers less than or equal to it in descending order.

To get the factorial of 4 four (24) we would use the following formula:

```
4! = 4 x 3 x 2 x 1 = 24
```

In Python, we can get factorials by using the `numpy`

package. Import it then use the `np.math.factorial()`

function, passing the number to calculate the factorial of as the first argument.

```
import numpy as np
result = np.math.factorial(4)
print(result)
```

```
24
```