18900400 has 30 divisors (see below), whose sum is σ = 45409172. Its totient is φ = 7560000.

The previous prime is 18900389. The next prime is 18900407. The reversal of 18900400 is 400981.

It is not an unprimeable number, because it can be changed into a prime (18900407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23226 + ... + 24025.

Almost surely, 2^18900400 is an apocalyptic number.

18900400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18900400 is an abundant number, since it is smaller than the sum of its proper divisors (26508772).

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

18900400 is a wasteful number, since it uses less digits than its factorization.

18900400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47269 (or 47258 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18900400 is about 4347.4590279840. The cubic root of 18900400 is about 266.3730796714.

The spelling of 18900400 in words is "eighteen million, nine hundred thousand, four hundred".