18231900 has 36 divisors (see below), whose sum is σ = 52751832. Its totient is φ = 4861760.

The previous prime is 18231883. The next prime is 18231901. The reversal of 18231900 is 913281.

It is a super-2 number, since 2×18231900² = 664804355220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231901) 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 11 ways as a sum of consecutive naturals, for example, 30087 + ... + 30686.

Almost surely, 2^18231900 is an apocalyptic number.

18231900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18231900 is an abundant number, since it is smaller than the sum of its proper divisors (34519932).

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

18231900 is a wasteful number, since it uses less digits than its factorization.

18231900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60790 (or 60783 counting only the distinct ones).

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

The square root of 18231900 is about 4269.8829023757. The cubic root of 18231900 is about 263.1948033145.

The spelling of 18231900 in words is "eighteen million, two hundred thirty-one thousand, nine hundred".