18516808 has 24 divisors (see below), whose sum is σ = 36886050. Its totient is φ = 8712704.

The previous prime is 18516781. The next prime is 18516821. The reversal of 18516808 is 80861581.

It can be written as a sum of positive squares in 3 ways, for example, as 18507204 + 9604 = 4302^2 + 98^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1693 + ... + 6316.

Almost surely, 2^18516808 is an apocalyptic number.

It is an amenable number.

18516808 is a deficient number, since it is larger than the sum of its proper divisors (18369242).

18516808 is a wasteful number, since it uses less digits than its factorization.

18516808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049 (or 8028 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 18516808 is about 4303.1160802377. The cubic root of 18516808 is about 264.5586959072.

The spelling of 18516808 in words is "eighteen million, five hundred sixteen thousand, eight hundred eight".