18989908 has 12 divisors (see below), whose sum is σ = 37979872. Its totient is φ = 8138520.

The previous prime is 18989899. The next prime is 18989909. The reversal of 18989908 is 80998981.

18989908 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989909) 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, 339078 + ... + 339133.

Almost surely, 2^18989908 is an apocalyptic number.

It is an amenable number.

18989908 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18989908 is a wasteful number, since it uses less digits than its factorization.

18989908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678222 (or 678220 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 52.

The square root of 18989908 is about 4357.7411579854. The cubic root of 18989908 is about 266.7929117515.

The spelling of 18989908 in words is "eighteen million, nine hundred eighty-nine thousand, nine hundred eight".