18036859 has 4 divisors (see below), whose sum is σ = 18222904. Its totient is φ = 17850816.

The previous prime is 18036857. The next prime is 18036877. The reversal of 18036859 is 95863081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18036859 - 2¹ = 18036857 is a prime.

It is a super-3 number, since 3×18036859³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18036857) 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, 92877 + ... + 93070.

It is an arithmetic number, because the mean of its divisors is an integer number (4555726).

Almost surely, 2^18036859 is an apocalyptic number.

18036859 is a deficient number, since it is larger than the sum of its proper divisors (186045).

18036859 is an equidigital number, since it uses as much as digits as its factorization.

18036859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186044.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 18036859 is about 4246.9823404389. The cubic root of 18036859 is about 262.2529024704.

The spelling of 18036859 in words is "eighteen million, thirty-six thousand, eight hundred fifty-nine".