16981904 has 20 divisors (see below), whose sum is σ = 33668976. Its totient is φ = 8293152.

The previous prime is 16981903. The next prime is 16981931. The reversal of 16981904 is 40918961.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16981903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11654 + ... + 13029.

Almost surely, 2^16981904 is an apocalyptic number.

It is an amenable number.

16981904 is a deficient number, since it is larger than the sum of its proper divisors (16687072).

16981904 is a wasteful number, since it uses less digits than its factorization.

16981904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24734 (or 24728 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 16981904 is about 4120.9105789862. The cubic root of 16981904 is about 257.0368915534.

The spelling of 16981904 in words is "sixteen million, nine hundred eighty-one thousand, nine hundred four".