12158 has 4 divisors (see below), whose sum is σ = 18240. Its totient is φ = 6078.

The previous prime is 12157. The next prime is 12161. The reversal of 12158 is 85121.

12158 is nontrivially palindromic in base 4.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3038 + ... + 3041.

It is an arithmetic number, because the mean of its divisors is an integer number (4560).

2¹²¹⁵⁸ is an apocalyptic number.

12158 is a deficient number, since it is larger than the sum of its proper divisors (6082).

12158 is an equidigital number, since it uses as much as digits as its factorization.

12158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081.

The product of its digits is 80, while the sum is 17.

The square root of 12158 is about 110.2633211907. The cubic root of 12158 is about 22.9943275236.

Adding to 12158 its reverse (85121), we get a palindrome (97279).

The spelling of 12158 in words is "twelve thousand, one hundred fifty-eight".