Factors / Factors of 189

Factors of 189

1, 3, 7, 9, 21, 27, 63, 189

189 breaks into 4 pairs, tested up to √189 ≈ 13.7; each pair multiplies back to 189 exactly. 189's full pair list is (1, 189), (3, 63), (7, 27), (9, 21), for 8 divisors in total. 189's divisors other than 189 itself sum to just 131, 58 below 189: the common deficient case. 189 is odd, digit sum 18 for 189; small divisors of 189 include 3, 7, 9. 189 has 8 divisors; 188 has 6 and 190 has 8, so 189 wins here. 189 divided by its largest divisor, 63, gives 3.