18866372 has 24 divisors (see below), whose sum is σ = 38505600. Its totient is φ = 8085000.

The previous prime is 18866363. The next prime is 18866381. The reversal of 18866372 is 27366881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18866363) and next prime (18866381).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5504 + ... + 8247.

It is an arithmetic number, because the mean of its divisors is an integer number (1604400).

Almost surely, 2^18866372 is an apocalyptic number.

It is an amenable number.

18866372 is an abundant number, since it is smaller than the sum of its proper divisors (19639228).

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

18866372 is a wasteful number, since it uses less digits than its factorization.

18866372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13776 (or 13760 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 18866372 is about 4343.5437145262. The cubic root of 18866372 is about 266.2131255919.

The spelling of 18866372 in words is "eighteen million, eight hundred sixty-six thousand, three hundred seventy-two".