18989700 has 36 divisors (see below), whose sum is σ = 54944400. Its totient is φ = 5063840.

The previous prime is 18989687. The next prime is 18989713. The reversal of 18989700 is 798981.

It is an interprime number because it is at equal distance from previous prime (18989687) and next prime (18989713).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31350 + ... + 31949.

Almost surely, 2^18989700 is an apocalyptic number.

18989700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18989700 is an abundant number, since it is smaller than the sum of its proper divisors (35954700).

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

18989700 is a wasteful number, since it uses less digits than its factorization.

18989700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63316 (or 63309 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 18989700 is about 4357.7172923447. The cubic root of 18989700 is about 266.7919376705.

The spelling of 18989700 in words is "eighteen million, nine hundred eighty-nine thousand, seven hundred".