18023900 has 18 divisors (see below), whose sum is σ = 39112080. Its totient is φ = 7209520.

The previous prime is 18023849. The next prime is 18023909. The reversal of 18023900 is 932081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18023909) 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, 90020 + ... + 90219.

Almost surely, 2^18023900 is an apocalyptic number.

18023900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18023900 is an abundant number, since it is smaller than the sum of its proper divisors (21088180).

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

18023900 is a wasteful number, since it uses less digits than its factorization.

18023900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180253 (or 180246 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18023900 is about 4245.4563947825. The cubic root of 18023900 is about 262.1900801943.

Adding to 18023900 its reverse (932081), we get a palindrome (18955981).

The spelling of 18023900 in words is "eighteen million, twenty-three thousand, nine hundred".