18319 has 4 divisors (see below), whose sum is σ = 20944. Its totient is φ = 15696.

The previous prime is 18313. The next prime is 18329. The reversal of 18319 is 91381.

18319 = T₄₄ + T₄₅ + ... + T₅₇.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18319 - 2³ = 18311 is a prime.

It is a super-2 number, since 2×18319² = 671171522, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1302 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (5236).

2¹⁸³¹⁹ is an apocalyptic number.

18319 is a deficient number, since it is larger than the sum of its proper divisors (2625).

18319 is an equidigital number, since it uses as much as digits as its factorization.

18319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624.

The product of its digits is 216, while the sum is 22.

The square root of 18319 is about 135.3477003868. The cubic root of 18319 is about 26.3613261407.

It can be divided in two parts, 183 and 19, that added together give a palindrome (202).

The spelling of 18319 in words is "eighteen thousand, three hundred nineteen".