18908 has 12 divisors (see below), whose sum is σ = 34440. Its totient is φ = 9072.

The previous prime is 18899. The next prime is 18911. The reversal of 18908 is 80981.

It is a congruent number.

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, 35 + ... + 197.

It is an arithmetic number, because the mean of its divisors is an integer number (2870).

2¹⁸⁹⁰⁸ is an apocalyptic number.

18908 is the 74-th centered heptagonal number.

It is an amenable number.

18908 is a deficient number, since it is larger than the sum of its proper divisors (15532).

18908 is a wasteful number, since it uses less digits than its factorization.

18908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18908 is about 137.5063634891. The cubic root of 18908 is about 26.6408778459.

The spelling of 18908 in words is "eighteen thousand, nine hundred eight".