Numbers / 903

The Number 903

903 is composite: factorization 3 × 7 × 43. That gives 903 exactly 8 divisors: 1, 3, 7, 21, 43, 129, 301, 903. 903's proper divisors total just 505, 398 short of 903, the deficient case most of 903's neighbors share too. 903 is also the 42nd triangular number, the sum of 1 through 42. 903 has a digit sum of 12; for 903, the digital root works out to 3. 903: 3, 7 all divide 903 evenly, out of 2-12. 903 is 1110000111 in binary and 387 in hex; as a Roman numeral it's CMIII.