18990888 has 32 divisors (see below), whose sum is σ = 54260160. Its totient is φ = 5425920.

The previous prime is 18990883. The next prime is 18990901. The reversal of 18990888 is 88809981.

It is a self number, because there is not a number n which added to its sum of digits gives 18990888.

It is not an unprimeable number, because it can be changed into a prime (18990883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56353 + ... + 56688.

It is an arithmetic number, because the mean of its divisors is an integer number (1695630).

Almost surely, 2^18990888 is an apocalyptic number.

It is an amenable number.

18990888 is an abundant number, since it is smaller than the sum of its proper divisors (35269272).

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

18990888 is a wasteful number, since it uses less digits than its factorization.

18990888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113057 (or 113053 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 51.

The square root of 18990888 is about 4357.8536001110. The cubic root of 18990888 is about 266.7975010761.

The spelling of 18990888 in words is "eighteen million, nine hundred ninety thousand, eight hundred eighty-eight".