Coding Assignments - Functions

Solve this coding assignments related to Python Functions. Links are given below. 

1_ https://lab.codingchaska.com/coding-problem/factorial-function 

2_ https://lab.codingchaska.com/coding-problem/highest-common-factor-hcf-function 

3_ https://lab.codingchaska.com/coding-problem/sum-of-digits-function 

4_ https://lab.codingchaska.com/coding-problem/lowest-common-multiple-lcm-function 

5_ https://lab.codingchaska.com/coding-problem/armstrong-number-function 

6_ https://lab.codingchaska.com/coding-problem/check-prime-number-function