18023859 has 24 divisors (see below), whose sum is σ = 31505760. Its totient is φ = 9692928.

The previous prime is 18023849. The next prime is 18023909. The reversal of 18023859 is 95832081.

It is not a de Polignac number, because 18023859 - 2⁴ = 18023843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18023849) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7344 + ... + 9485.

It is an arithmetic number, because the mean of its divisors is an integer number (1312740).

Almost surely, 2^18023859 is an apocalyptic number.

18023859 is a deficient number, since it is larger than the sum of its proper divisors (13481901).

18023859 is a wasteful number, since it uses less digits than its factorization.

18023859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16859 (or 16856 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18023859 is about 4245.4515660881. The cubic root of 18023859 is about 262.1898813879.

The spelling of 18023859 in words is "eighteen million, twenty-three thousand, eight hundred fifty-nine".