123158 has 16 divisors (see below), whose sum is σ = 222720. Its totient is φ = 49896.

The previous prime is 123143. The next prime is 123169. The reversal of 123158 is 851321.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35 + ... + 497.

It is an arithmetic number, because the mean of its divisors is an integer number (13920).

2¹²³¹⁵⁸ is an apocalyptic number.

123158 is a deficient number, since it is larger than the sum of its proper divisors (99562).

123158 is a wasteful number, since it uses less digits than its factorization.

123158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491.

The product of its digits is 240, while the sum is 20.

The square root of 123158 is about 350.9387410931. The cubic root of 123158 is about 49.7531836384.

Adding to 123158 its reverse (851321), we get a palindrome (974479).

The spelling of 123158 in words is "one hundred twenty-three thousand, one hundred fifty-eight".