Step 1: Divide the number into separate digits:
38389 => 3 8 3 8 9
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
3 to 8 = 5
8 to 3 = 5
3 to 8 = 5
8 to 9 = 1
9 to 3 = 6
Step 3: Combine the filters to a string:
5 5 5 1 6 = 55516