18955 has 8 divisors (see below), whose sum is σ = 24192. Its totient is φ = 14208.

The previous prime is 18947. The next prime is 18959. The reversal of 18955 is 55981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18955 - 2³ = 18947 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27 + ... + 196.

It is an arithmetic number, because the mean of its divisors is an integer number (3024).

2¹⁸⁹⁵⁵ is an apocalyptic number.

18955 is a deficient number, since it is larger than the sum of its proper divisors (5237).

18955 is a wasteful number, since it uses less digits than its factorization.

18955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

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

The square root of 18955 is about 137.6771585994. The cubic root of 18955 is about 26.6629335052.

The spelling of 18955 in words is "eighteen thousand, nine hundred fifty-five".