18508900 has 18 divisors (see below), whose sum is σ = 40164530. Its totient is φ = 7403520.

The previous prime is 18508871. The next prime is 18508901. The reversal of 18508900 is 980581.

It can be written as a sum of positive squares in 3 ways, for example, as 599076 + 17909824 = 774^2 + 4232^2 .

It is not an unprimeable number, because it can be changed into a prime (18508901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92445 + ... + 92644.

Almost surely, 2^18508900 is an apocalyptic number.

18508900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18508900 is an abundant number, since it is smaller than the sum of its proper divisors (21655630).

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

18508900 is a wasteful number, since it uses less digits than its factorization.

18508900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185103 (or 185096 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 18508900 is about 4302.1971131040. The cubic root of 18508900 is about 264.5210287227.

The spelling of 18508900 in words is "eighteen million, five hundred eight thousand, nine hundred".