Numbers / 345

The Number 345

345 is composite: factorization 3 × 5 × 23. That gives 345 exactly 8 divisors: 1, 3, 5, 15, 23, 69, 115, 345. 345's proper divisors total just 231, 114 short of 345, the deficient case most of 345's neighbors share too. 345 has a digit sum of 12; for 345, the digital root works out to 3. 345: 3, 5 all divide 345 evenly, out of 2-12. 345 is 101011001 in binary and 159 in hex; as a Roman numeral it's CCCXLV.