18866224 has 20 divisors (see below), whose sum is σ = 39365536. Its totient is φ = 8707392.

The previous prime is 18866213. The next prime is 18866291. The reversal of 18866224 is 42266881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45144 + ... + 45559.

Almost surely, 2^18866224 is an apocalyptic number.

It is an amenable number.

18866224 is an abundant number, since it is smaller than the sum of its proper divisors (20499312).

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

18866224 is a wasteful number, since it uses less digits than its factorization.

18866224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90724 (or 90718 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 18866224 is about 4343.5266777125. The cubic root of 18866224 is about 266.2124294743.

The spelling of 18866224 in words is "eighteen million, eight hundred sixty-six thousand, two hundred twenty-four".