16681904 has 10 divisors (see below), whose sum is σ = 32321220. Its totient is φ = 8340944.

The previous prime is 16681901. The next prime is 16681919. The reversal of 16681904 is 40918661.

It is not an unprimeable number, because it can be changed into a prime (16681901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521294 + ... + 521325.

It is an arithmetic number, because the mean of its divisors is an integer number (3232122).

Almost surely, 2^16681904 is an apocalyptic number.

It is an amenable number.

16681904 is a deficient number, since it is larger than the sum of its proper divisors (15639316).

16681904 is a wasteful number, since it uses less digits than its factorization.

16681904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042627 (or 1042621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 16681904 is about 4084.3486628837. The cubic root of 16681904 is about 255.5142971691.

The spelling of 16681904 in words is "sixteen million, six hundred eighty-one thousand, nine hundred four".