18000559 has 16 divisors (see below), whose sum is σ = 19436544. Its totient is φ = 16632000.

The previous prime is 18000547. The next prime is 18000571. The reversal of 18000559 is 95500081.

It is an interprime number because it is at equal distance from previous prime (18000547) and next prime (18000571).

It is a cyclic number.

It is not a de Polignac number, because 18000559 - 2⁵ = 18000527 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000539) 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 15 ways as a sum of consecutive naturals, for example, 119134 + ... + 119284.

It is an arithmetic number, because the mean of its divisors is an integer number (1214784).

Almost surely, 2^18000559 is an apocalyptic number.

18000559 is a deficient number, since it is larger than the sum of its proper divisors (1435985).

18000559 is a wasteful number, since it uses less digits than its factorization.

18000559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 18000559 is about 4242.7065653896. The cubic root of 18000559 is about 262.0768523455.

The spelling of 18000559 in words is "eighteen million, five hundred fifty-nine", and thus it is an aban number.