Step 1: Divide the number into separate digits:
49176 => 4 9 1 7 6
Step 2: Calculate the distance between each digit and the next (the last digit with the first):
4 to 9 = 5
9 to 1 = 8
1 to 7 = 6
7 to 6 = 1
6 to 4 = 2
Step 3: Combine the filters to a string:
5 8 6 1 2 = 58612