18158 has 8 divisors (see below), whose sum is σ = 31152. Its totient is φ = 7776.

The previous prime is 18149. The next prime is 18169. The reversal of 18158 is 85181.

18158 is nontrivially palindromic in base 6.

18158 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

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

It is a plaindrome in base 16.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

18158 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635 + ... + 662.

It is an arithmetic number, because the mean of its divisors is an integer number (3894).

2¹⁸¹⁵⁸ is an apocalyptic number.

18158 is a deficient number, since it is larger than the sum of its proper divisors (12994).

18158 is a wasteful number, since it uses less digits than its factorization.

18158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306.

The product of its digits is 320, while the sum is 23.

The square root of 18158 is about 134.7516233668. The cubic root of 18158 is about 26.2838716190.

Adding to 18158 its sum of digits (23), we get a palindrome (18181).

The spelling of 18158 in words is "eighteen thousand, one hundred fifty-eight".