18213090 has 32 divisors (see below), whose sum is σ = 49956480. Its totient is φ = 4162944.

The previous prime is 18213067. The next prime is 18213101. The reversal of 18213090 is 9031281.

It is a self number, because there is not a number n which added to its sum of digits gives 18213090.

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, 43155 + ... + 43574.

It is an arithmetic number, because the mean of its divisors is an integer number (1561140).

Almost surely, 2^18213090 is an apocalyptic number.

18213090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18213090 is an abundant number, since it is smaller than the sum of its proper divisors (31743390).

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

18213090 is a wasteful number, since it uses less digits than its factorization.

18213090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86746.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18213090 is about 4267.6796974468. The cubic root of 18213090 is about 263.1042587601.

The spelling of 18213090 in words is "eighteen million, two hundred thirteen thousand, ninety".