138173 has 4 divisors (see below), whose sum is σ = 157920. Its totient is φ = 118428.

The previous prime is 138163. The next prime is 138179. The reversal of 138173 is 371831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138173 - 2⁴ = 138157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138179) 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 in 3 ways as a sum of consecutive naturals, for example, 9863 + ... + 9876.

It is an arithmetic number, because the mean of its divisors is an integer number (39480).

2¹³⁸¹⁷³ is an apocalyptic number.

It is an amenable number.

138173 is a deficient number, since it is larger than the sum of its proper divisors (19747).

138173 is an equidigital number, since it uses as much as digits as its factorization.

138173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19746.

The product of its digits is 504, while the sum is 23.

The square root of 138173 is about 371.7162896619. The cubic root of 138173 is about 51.6980777893.

The spelling of 138173 in words is "one hundred thirty-eight thousand, one hundred seventy-three".