18338900 has 18 divisors (see below), whose sum is σ = 39795630. Its totient is φ = 7335520.

The previous prime is 18338867. The next prime is 18338921. The reversal of 18338900 is 983381.

It can be written as a sum of positive squares in 3 ways, for example, as 71824 + 18267076 = 268^2 + 4274^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91595 + ... + 91794.

Almost surely, 2^18338900 is an apocalyptic number.

18338900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18338900 is an abundant number, since it is smaller than the sum of its proper divisors (21456730).

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

18338900 is a wasteful number, since it uses less digits than its factorization.

18338900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183403 (or 183396 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18338900 is about 4282.3941901698. The cubic root of 18338900 is about 263.7086815624.

The spelling of 18338900 in words is "eighteen million, three hundred thirty-eight thousand, nine hundred".