18855 has 12 divisors (see below), whose sum is σ = 32760. Its totient is φ = 10032.

The previous prime is 18839. The next prime is 18859. The reversal of 18855 is 55881.

It is not a de Polignac number, because 18855 - 2⁴ = 18839 is a prime.

It is a super-2 number, since 2×18855² = 711022050, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18859) 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, 165 + ... + 254.

It is an arithmetic number, because the mean of its divisors is an integer number (2730).

18855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18855 is a deficient number, since it is larger than the sum of its proper divisors (13905).

18855 is a wasteful number, since it uses less digits than its factorization.

18855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 427 counting only the distinct ones).

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

The square root of 18855 is about 137.3135098961. The cubic root of 18855 is about 26.6159626803.

It can be divided in two parts, 188 and 55, that added together give a 5-th power (243 = 3⁵).

The spelling of 18855 in words is "eighteen thousand, eight hundred fifty-five".