18305 has 8 divisors (see below), whose sum is σ = 25152. Its totient is φ = 12528.

The previous prime is 18301. The next prime is 18307. The reversal of 18305 is 50381.

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 18305 - 2² = 18301 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

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 (18301) 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, 227 + ... + 296.

It is an arithmetic number, because the mean of its divisors is an integer number (3144).

2¹⁸³⁰⁵ is an apocalyptic number.

It is an amenable number.

18305 is a deficient number, since it is larger than the sum of its proper divisors (6847).

18305 is an equidigital number, since it uses as much as digits as its factorization.

18305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 18305 is about 135.2959718543. The cubic root of 18305 is about 26.3546090232.

Adding to 18305 its reverse (50381), we get a palindrome (68686).

It can be divided in two parts, 18 and 305, that added together give a palindrome (323).

The spelling of 18305 in words is "eighteen thousand, three hundred five".