18871900 has 18 divisors (see below), whose sum is σ = 40952240. Its totient is φ = 7548720.

The previous prime is 18871889. The next prime is 18871903. The reversal of 18871900 is 917881.

It is a super-2 number, since 2×18871900² = 712297219220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871903) 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, 94260 + ... + 94459.

Almost surely, 2^18871900 is an apocalyptic number.

18871900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18871900 is an abundant number, since it is smaller than the sum of its proper divisors (22080340).

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

18871900 is a wasteful number, since it uses less digits than its factorization.

18871900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188733 (or 188726 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 18871900 is about 4344.1800146863. The cubic root of 18871900 is about 266.2391239211.

The spelling of 18871900 in words is "eighteen million, eight hundred seventy-one thousand, nine hundred".