138929709 has 16 divisors (see below), whose sum is σ = 190589760. Its totient is φ = 89953920.

The previous prime is 138929701. The next prime is 138929711. The reversal of 138929709 is 907929831.

138929709 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 138929709 - 2³ = 138929701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138929701) 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, 107137 + ... + 108425.

It is an arithmetic number, because the mean of its divisors is an integer number (11911860).

Almost surely, 2^138929709 is an apocalyptic number.

It is an amenable number.

138929709 is a deficient number, since it is larger than the sum of its proper divisors (51660051).

138929709 is a wasteful number, since it uses less digits than its factorization.

138929709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 138929709 is about 11786.8447431872. The cubic root of 138929709 is about 517.9228143865.

The spelling of 138929709 in words is "one hundred thirty-eight million, nine hundred twenty-nine thousand, seven hundred nine".