18988090 has 16 divisors (see below), whose sum is σ = 37285920. Its totient is φ = 6904720.

The previous prime is 18988037. The next prime is 18988091. The reversal of 18988090 is 9088981.

It is not an unprimeable number, because it can be changed into a prime (18988091) 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, 86200 + ... + 86419.

It is an arithmetic number, because the mean of its divisors is an integer number (2330370).

Almost surely, 2^18988090 is an apocalyptic number.

18988090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18988090 is a deficient number, since it is larger than the sum of its proper divisors (18297830).

18988090 is a wasteful number, since it uses less digits than its factorization.

18988090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172637.

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

The square root of 18988090 is about 4357.5325586850. The cubic root of 18988090 is about 266.7843976679.

The spelling of 18988090 in words is "eighteen million, nine hundred eighty-eight thousand, ninety".