Numbers / 385

The Number 385

385 is composite: factorization 5 × 7 × 11. That gives 385 exactly 8 divisors: 1, 5, 7, 11, 35, 55, 77, 385. 385's proper divisors total just 191, 194 short of 385, the deficient case most of 385's neighbors share too. 385 has a digit sum of 16; for 385, the digital root works out to 7. 385: 5, 7, 11 all divide 385 evenly, out of 2-12. 385 is 110000001 in binary and 181 in hex; as a Roman numeral it's CCCLXXXV.