18658990 has 32 divisors (see below), whose sum is σ = 39283200. Its totient is φ = 6247584.

The previous prime is 18658987. The next prime is 18659009. The reversal of 18658990 is 9985681.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18658990.

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, 90 + ... + 6109.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^18658990 is an apocalyptic number.

18658990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18658990 is an abundant number, since it is smaller than the sum of its proper divisors (20624210).

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

18658990 is a wasteful number, since it uses less digits than its factorization.

18658990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 18658990 is about 4319.6053060436. The cubic root of 18658990 is about 265.2341113787.

The spelling of 18658990 in words is "eighteen million, six hundred fifty-eight thousand, nine hundred ninety".