16989956 has 12 divisors (see below), whose sum is σ = 30536268. Its totient is φ = 8265312.

The previous prime is 16989943. The next prime is 16989967. The reversal of 16989956 is 65998961.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 9060100 = 2816^2 + 3010^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16989898 and 16989907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57251 + ... + 57546.

It is an arithmetic number, because the mean of its divisors is an integer number (2544689).

Almost surely, 2^16989956 is an apocalyptic number.

It is an amenable number.

16989956 is a deficient number, since it is larger than the sum of its proper divisors (13546312).

16989956 is a wasteful number, since it uses less digits than its factorization.

16989956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114838 (or 114836 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 53.

The square root of 16989956 is about 4121.8874317477. The cubic root of 16989956 is about 257.0775099675.

The spelling of 16989956 in words is "sixteen million, nine hundred eighty-nine thousand, nine hundred fifty-six".