18323859 has 4 divisors (see below), whose sum is σ = 24431816. Its totient is φ = 12215904.

The previous prime is 18323797. The next prime is 18323861. The reversal of 18323859 is 95832381.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18323859 - 2⁷ = 18323731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18323159) 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 3 ways as a sum of consecutive naturals, for example, 3053974 + ... + 3053979.

It is an arithmetic number, because the mean of its divisors is an integer number (6107954).

Almost surely, 2^18323859 is an apocalyptic number.

18323859 is a deficient number, since it is larger than the sum of its proper divisors (6107957).

18323859 is an equidigital number, since it uses as much as digits as its factorization.

18323859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6107956.

The product of its digits is 51840, while the sum is 39.

The square root of 18323859 is about 4280.6376861398. The cubic root of 18323859 is about 263.6365666017.

It can be divided in two parts, 183 and 23859, that added together give a palindrome (24042).

The spelling of 18323859 in words is "eighteen million, three hundred twenty-three thousand, eight hundred fifty-nine".