Numbers / 369

The Number 369

369 is composite: factorization 3^2 × 41. That gives 369 exactly 6 divisors: 1, 3, 9, 41, 123, 369. 369's proper divisors total just 177, 192 short of 369, the deficient case most of 369's neighbors share too. 369 has a digit sum of 18; for 369, the digital root works out to 9. 369: 3, 9 all divide 369 evenly, out of 2-12. 369 is 101110001 in binary and 171 in hex; as a Roman numeral it's CCCLXIX.