18990808 has 16 divisors (see below), whose sum is σ = 35881560. Its totient is φ = 9422400.

The previous prime is 18990793. The next prime is 18990809. The reversal of 18990808 is 80809981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8013 + ... + 10108.

Almost surely, 2^18990808 is an apocalyptic number.

It is an amenable number.

18990808 is a deficient number, since it is larger than the sum of its proper divisors (16890752).

18990808 is a wasteful number, since it uses less digits than its factorization.

18990808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258 (or 18254 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 18990808 is about 4357.8444212707. The cubic root of 18990808 is about 266.7971264433.

The spelling of 18990808 in words is "eighteen million, nine hundred ninety thousand, eight hundred eight".