18089859 has 4 divisors (see below), whose sum is σ = 24119816. Its totient is φ = 12059904.

The previous prime is 18089849. The next prime is 18089867. The reversal of 18089859 is 95898081.

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

It is not a de Polignac number, because 18089859 - 2¹³ = 18081667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18089809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3014974 + ... + 3014979.

It is an arithmetic number, because the mean of its divisors is an integer number (6029954).

Almost surely, 2^18089859 is an apocalyptic number.

18089859 is a deficient number, since it is larger than the sum of its proper divisors (6029957).

18089859 is an equidigital number, since it uses as much as digits as its factorization.

18089859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6029956.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 18089859 is about 4253.2174879731. The cubic root of 18089859 is about 262.5095216501.

The spelling of 18089859 in words is "eighteen million, eighty-nine thousand, eight hundred fifty-nine".