18864228 has 24 divisors (see below), whose sum is σ = 45207232. Its totient is φ = 6117984.

The previous prime is 18864221. The next prime is 18864253. The reversal of 18864228 is 82246881.

It is not an unprimeable number, because it can be changed into a prime (18864221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20800 + ... + 21687.

Almost surely, 2^18864228 is an apocalyptic number.

It is an amenable number.

18864228 is an abundant number, since it is smaller than the sum of its proper divisors (26343004).

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

18864228 is a wasteful number, since it uses less digits than its factorization.

18864228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42531 (or 42529 counting only the distinct ones).

The product of its digits is 49152, while the sum is 39.

The square root of 18864228 is about 4343.2969044264. The cubic root of 18864228 is about 266.2030409368.

The spelling of 18864228 in words is "eighteen million, eight hundred sixty-four thousand, two hundred twenty-eight".