Factors / Factors of 289

Factors of 289

1, 17, 289

289 is a perfect square (17² = 289); that gives 289 an odd 3-divisor count, since only 17 pairs with itself. 289's full pair list is (1, 289), (17, 17), for 3 divisors in total. 289's divisors other than 289 itself sum to just 18, 271 below 289: the common deficient case. 289 is odd, digit sum 19 for 289; none of 2-12 divide 289 evenly. 289 has 3 divisors; 288 has 18 and 290 has 8, so 288 wins here. 289 divided by its largest divisor, 17, gives 17.