18358990 has 16 divisors (see below), whose sum is σ = 35588448. Its totient is φ = 6778656.

The previous prime is 18358973. The next prime is 18359023. The reversal of 18358990 is 9985381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70482 + ... + 70741.

It is an arithmetic number, because the mean of its divisors is an integer number (2224278).

Almost surely, 2^18358990 is an apocalyptic number.

18358990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18358990 is a deficient number, since it is larger than the sum of its proper divisors (17229458).

18358990 is a wasteful number, since it uses less digits than its factorization.

18358990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141243.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18358990 is about 4284.7391985977. The cubic root of 18358990 is about 263.8049427702.

The spelling of 18358990 in words is "eighteen million, three hundred fifty-eight thousand, nine hundred ninety".