18558 has 12 divisors (see below), whose sum is σ = 40248. Its totient is φ = 6180.

The previous prime is 18553. The next prime is 18583. The reversal of 18558 is 85581.

18558 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 498 + ... + 533.

It is an arithmetic number, because the mean of its divisors is an integer number (3354).

2¹⁸⁵⁵⁸ is an apocalyptic number.

18558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18558 is an abundant number, since it is smaller than the sum of its proper divisors (21690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18558 is a wasteful number, since it uses less digits than its factorization.

18558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1036 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 18558 is about 136.2277504769. The cubic root of 18558 is about 26.4754727370.

It can be divided in two parts, 185 and 58, that added together give a 5-th power (243 = 3⁵).

The spelling of 18558 in words is "eighteen thousand, five hundred fifty-eight".