18989400 has 48 divisors (see below), whose sum is σ = 58869000. Its totient is φ = 5063680.

The previous prime is 18989393. The next prime is 18989401. The reversal of 18989400 is 498981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18989401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15225 + ... + 16424.

Almost surely, 2^18989400 is an apocalyptic number.

18989400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18989400 is an abundant number, since it is smaller than the sum of its proper divisors (39879600).

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

18989400 is a wasteful number, since it uses less digits than its factorization.

18989400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31668 (or 31659 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18989400 is about 4357.6828705173. The cubic root of 18989400 is about 266.7905327334.

The spelling of 18989400 in words is "eighteen million, nine hundred eighty-nine thousand, four hundred".