18023730 has 16 divisors (see below), whose sum is σ = 43257024. Its totient is φ = 4806320.

The previous prime is 18023729. The next prime is 18023777. The reversal of 18023730 is 3732081.

It is a super-2 number, since 2×18023730² = 649709686225800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18023730.

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, 300366 + ... + 300425.

It is an arithmetic number, because the mean of its divisors is an integer number (2703564).

Almost surely, 2^18023730 is an apocalyptic number.

18023730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18023730 is an abundant number, since it is smaller than the sum of its proper divisors (25233294).

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

18023730 is a wasteful number, since it uses less digits than its factorization.

18023730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600801.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 18023730 is about 4245.4363733308. The cubic root of 18023730 is about 262.1892558730.

The spelling of 18023730 in words is "eighteen million, twenty-three thousand, seven hundred thirty".