18864018 has 24 divisors (see below), whose sum is σ = 41870556. Its totient is φ = 6134400.

The previous prime is 18863987. The next prime is 18864023. The reversal of 18864018 is 81046881.

18864018 is a `hidden beast` number, since 1 + 8 + 8 + 640 + 1 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18636489 + 227529 = 4317^2 + 477^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12043 + ... + 13518.

Almost surely, 2^18864018 is an apocalyptic number.

18864018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18864018 is an abundant number, since it is smaller than the sum of its proper divisors (23006538).

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

18864018 is a wasteful number, since it uses less digits than its factorization.

18864018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25610 (or 25607 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18864018 is about 4343.2727291755. The cubic root of 18864018 is about 266.2020531264.

The spelling of 18864018 in words is "eighteen million, eight hundred sixty-four thousand, eighteen".