138039123 has 32 divisors (see below), whose sum is σ = 205148160. Its totient is φ = 82162080.

The previous prime is 138039067. The next prime is 138039127. The reversal of 138039123 is 321930831.

138039123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138039123 - 2⁶ = 138039059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138039127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92340 + ... + 93822.

It is an arithmetic number, because the mean of its divisors is an integer number (6410880).

Almost surely, 2^138039123 is an apocalyptic number.

138039123 is a deficient number, since it is larger than the sum of its proper divisors (67109037).

138039123 is a wasteful number, since it uses less digits than its factorization.

138039123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 138039123 is about 11749.0051919301. The cubic root of 138039123 is about 516.8137549077.

Adding to 138039123 its reverse (321930831), we get a palindrome (459969954).

The spelling of 138039123 in words is "one hundred thirty-eight million, thirty-nine thousand, one hundred twenty-three".