18538872 has 32 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 5617760.

The previous prime is 18538843. The next prime is 18538873. The reversal of 18538872 is 27883581.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34848 + ... + 35375.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^18538872 is an apocalyptic number.

18538872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18538872 is an abundant number, since it is smaller than the sum of its proper divisors (32022408).

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

18538872 is a wasteful number, since it uses less digits than its factorization.

18538872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70243 (or 70239 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 18538872 is about 4305.6790405231. The cubic root of 18538872 is about 264.6637339195.

The spelling of 18538872 in words is "eighteen million, five hundred thirty-eight thousand, eight hundred seventy-two".