18057 has 8 divisors (see below), whose sum is σ = 25984. Its totient is φ = 11088.

The previous prime is 18049. The next prime is 18059. The reversal of 18057 is 75081.

It is a happy number.

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

It is not a de Polignac number, because 18057 - 2³ = 18049 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (18059) 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, 193 + ... + 270.

It is an arithmetic number, because the mean of its divisors is an integer number (3248).

2¹⁸⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

18057 is a deficient number, since it is larger than the sum of its proper divisors (7927).

18057 is a wasteful number, since it uses less digits than its factorization.

18057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 18057 is about 134.3763372026. The cubic root of 18057 is about 26.2350481745.

The spelling of 18057 in words is "eighteen thousand, fifty-seven".