18798990 has 32 divisors (see below), whose sum is σ = 51563520. Its totient is φ = 4296864.

The previous prime is 18798973. The next prime is 18799009. The reversal of 18798990 is 9989781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44550 + ... + 44969.

It is an arithmetic number, because the mean of its divisors is an integer number (1611360).

Almost surely, 2^18798990 is an apocalyptic number.

18798990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18798990 is an abundant number, since it is smaller than the sum of its proper divisors (32764530).

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

18798990 is a wasteful number, since it uses less digits than its factorization.

18798990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89536.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 18798990 is about 4335.7802066064. The cubic root of 18798990 is about 265.8958172669.

The spelling of 18798990 in words is "eighteen million, seven hundred ninety-eight thousand, nine hundred ninety".