18042559 has 12 divisors (see below), whose sum is σ = 19341000. Its totient is φ = 16827008.

The previous prime is 18042551. The next prime is 18042581. The reversal of 18042559 is 95524081.

It is not a de Polignac number, because 18042559 - 2³ = 18042551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42852 + ... + 43270.

It is an arithmetic number, because the mean of its divisors is an integer number (1611750).

Almost surely, 2^18042559 is an apocalyptic number.

18042559 is a deficient number, since it is larger than the sum of its proper divisors (1298441).

18042559 is a wasteful number, since it uses less digits than its factorization.

18042559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 18042559 is about 4247.6533521463. The cubic root of 18042559 is about 262.2805252419.

The spelling of 18042559 in words is "eighteen million, forty-two thousand, five hundred fifty-nine".