23138 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 11044.

The previous prime is 23131. The next prime is 23143. The reversal of 23138 is 83132.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (23131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206 + ... + 297.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

2²³¹³⁸ is an apocalyptic number.

23138 is a deficient number, since it is larger than the sum of its proper divisors (13150).

23138 is a wasteful number, since it uses less digits than its factorization.

23138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 144, while the sum is 17.

The square root of 23138 is about 152.1118009886. Note that the first 3 decimals coincide. The cubic root of 23138 is about 28.4954337611.

It can be divided in two parts, 231 and 38, that multiplied together give a palindrome (8778).

The spelling of 23138 in words is "twenty-three thousand, one hundred thirty-eight".