18017859 has 4 divisors (see below), whose sum is σ = 24023816. Its totient is φ = 12011904.

The previous prime is 18017843. The next prime is 18017887. The reversal of 18017859 is 95871081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95871081 = 3 ⋅31957027.

It is not a de Polignac number, because 18017859 - 2⁴ = 18017843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18017899) 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, 3002974 + ... + 3002979.

It is an arithmetic number, because the mean of its divisors is an integer number (6005954).

Almost surely, 2^18017859 is an apocalyptic number.

18017859 is a deficient number, since it is larger than the sum of its proper divisors (6005957).

18017859 is an equidigital number, since it uses as much as digits as its factorization.

18017859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6005956.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 18017859 is about 4244.7448686582. The cubic root of 18017859 is about 262.1607845135.

The spelling of 18017859 in words is "eighteen million, seventeen thousand, eight hundred fifty-nine".