18918800 has 30 divisors (see below), whose sum is σ = 45453378. Its totient is φ = 7567360.

The previous prime is 18918797. The next prime is 18918829. The reversal of 18918800 is 881981.

It can be written as a sum of positive squares in 3 ways, for example, as 394384 + 18524416 = 628^2 + 4304^2 .

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, 23249 + ... + 24048.

Almost surely, 2^18918800 is an apocalyptic number.

18918800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18918800 is an abundant number, since it is smaller than the sum of its proper divisors (26534578).

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

18918800 is a wasteful number, since it uses less digits than its factorization.

18918800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47315 (or 47304 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18918800 is about 4349.5746918521. The cubic root of 18918800 is about 266.4594918642.

The spelling of 18918800 in words is "eighteen million, nine hundred eighteen thousand, eight hundred".