Teaser Of The Day No. 20

[Carl]

9808 = 6
1731 = 0
2272 = 0
6668 = 5
3311 = 0
3124 = 1
2661 = 2
3133 = 0
0000 = 4
5555 = 0
2221 = 0
3171 = 0
3189 = 3
6908 = 5
7777 = 0
9999 = 4
5677 = 1
8655 = 3
1889 = 5
3551 = 0

1852 = ?


Answer will be provided next Thursday evening after 21:00.

[Carl]

ANSWER

1852 = 2

2 is the number of circles in the number.