18173 has 4 divisors (see below), whose sum is σ = 19260. Its totient is φ = 17088.

The previous prime is 18169. The next prime is 18181. The reversal of 18173 is 37181.

18173 is nontrivially palindromic in base 11.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11449 + 6724 = 107^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 18173 - 2² = 18169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133) 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, 518 + ... + 551.

It is an arithmetic number, because the mean of its divisors is an integer number (4815).

2¹⁸¹⁷³ is an apocalyptic number.

It is an amenable number.

18173 is a deficient number, since it is larger than the sum of its proper divisors (1087).

18173 is a wasteful number, since it uses less digits than its factorization.

18173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086.

The product of its digits is 168, while the sum is 20.

The square root of 18173 is about 134.8072698336. The cubic root of 18173 is about 26.2911071728.

It can be divided in two parts, 18 and 173, that added together give a palindrome (191).

The spelling of 18173 in words is "eighteen thousand, one hundred seventy-three".