1215
5 x 3 = 15
400 x 3 = 1200
15 + 1200 = 1215
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67 with 3 remaining 405 - 3 = 402 = 6 x 67
405 x 405 = 164,025
405 x 100 = 40500
Pairs of positive integer factors of 405 are: 1 x 405 3 x 135 5 x 81 9 x 45 15 x 27 And their reverses.
38,880