138039 has 16 divisors (see below), whose sum is σ = 207360. Its totient is φ = 80960.

The previous prime is 138007. The next prime is 138041. The reversal of 138039 is 930831.

It is not a de Polignac number, because 138039 - 2⁵ = 138007 is a prime.

It is a super-3 number, since 3×138039³ = 7890902333259957, which contains 333 as substring.

138039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1507 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (12960).

2¹³⁸⁰³⁹ is an apocalyptic number.

138039 is a deficient number, since it is larger than the sum of its proper divisors (69321).

138039 is a wasteful number, since it uses less digits than its factorization.

138039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 138039 is about 371.5360009474. The cubic root of 138039 is about 51.6813601405.

The spelling of 138039 in words is "one hundred thirty-eight thousand, thirty-nine".