Numbers / 16

The Number 16

16 is composite: factorization 2^4. That gives 16 exactly 5 divisors: 1, 2, 4, 8, 16. 16's proper divisors total just 15, 1 short of 16, the deficient case most of 16's neighbors share too. 16 is also a perfect square, since 4² = 16. 16 has a digit sum of 7; for 16, the digital root works out to 7. 16: 2, 4, 8 all divide 16 evenly, out of 2-12. 16 is 10000 in binary and 10 in hex; as a Roman numeral it's XVI.