Numbers / 357

The Number 357

357 is composite: factorization 3 × 7 × 17. That gives 357 exactly 8 divisors: 1, 3, 7, 17, 21, 51, 119, 357. 357's proper divisors total just 219, 138 short of 357, the deficient case most of 357's neighbors share too. 357 has a digit sum of 15; for 357, the digital root works out to 6. 357: 3, 7 all divide 357 evenly, out of 2-12. 357 is 101100101 in binary and 165 in hex; as a Roman numeral it's CCCLVII.