18990908 has 6 divisors (see below), whose sum is σ = 33234096. Its totient is φ = 9495452.

The previous prime is 18990901. The next prime is 18990919. The reversal of 18990908 is 80909981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2373860 + ... + 2373867.

It is an arithmetic number, because the mean of its divisors is an integer number (5539016).

Almost surely, 2^18990908 is an apocalyptic number.

It is an amenable number.

18990908 is a deficient number, since it is larger than the sum of its proper divisors (14243188).

18990908 is a wasteful number, since it uses less digits than its factorization.

18990908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747731 (or 4747729 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 18990908 is about 4357.8558948180. The cubic root of 18990908 is about 266.7975947342.

The spelling of 18990908 in words is "eighteen million, nine hundred ninety thousand, nine hundred eight".