17859 has 4 divisors (see below), whose sum is σ = 23816. Its totient is φ = 11904.

The previous prime is 17851. The next prime is 17863. The reversal of 17859 is 95871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95871 = 3 ⋅31957.

It is not a de Polignac number, because 17859 - 2³ = 17851 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (17851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2974 + ... + 2979.

It is an arithmetic number, because the mean of its divisors is an integer number (5954).

17859 is a deficient number, since it is larger than the sum of its proper divisors (5957).

17859 is an equidigital number, since it uses as much as digits as its factorization.

17859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956.

The product of its digits is 2520, while the sum is 30.

The square root of 17859 is about 133.6375695678. The cubic root of 17859 is about 26.1388040111.

The spelling of 17859 in words is "seventeen thousand, eight hundred fifty-nine".