138765039 has 16 divisors (see below), whose sum is σ = 211830528. Its totient is φ = 79152192.

The previous prime is 138765023. The next prime is 138765047. The reversal of 138765039 is 930567831.

138765039 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 138765039 - 2⁴ = 138765023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138765019) 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, 6699 + ... + 17955.

It is an arithmetic number, because the mean of its divisors is an integer number (13239408).

Almost surely, 2^138765039 is an apocalyptic number.

138765039 is a deficient number, since it is larger than the sum of its proper divisors (73065489).

138765039 is a wasteful number, since it uses less digits than its factorization.

138765039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11854.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 138765039 is about 11779.8573420904. The cubic root of 138765039 is about 517.7181063880.

It can be divided in two parts, 13876 and 5039, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 138765039 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, thirty-nine".