18030559 has 4 divisors (see below), whose sum is σ = 18045720. Its totient is φ = 18015400.

The previous prime is 18030497. The next prime is 18030569. The reversal of 18030559 is 95503081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18030559 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18030559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18030569) 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, 5629 + ... + 8230.

It is an arithmetic number, because the mean of its divisors is an integer number (4511430).

Almost surely, 2^18030559 is an apocalyptic number.

18030559 is a deficient number, since it is larger than the sum of its proper divisors (15161).

18030559 is a wasteful number, since it uses less digits than its factorization.

18030559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15160.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 18030559 is about 4246.2405725536. The cubic root of 18030559 is about 262.2223652672. Note that the first 3 decimals are identical.

The spelling of 18030559 in words is "eighteen million, thirty thousand, five hundred fifty-nine".