138929079 has 4 divisors (see below), whose sum is σ = 185238776. Its totient is φ = 92619384.

The previous prime is 138929057. The next prime is 138929081. The reversal of 138929079 is 970929831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138929079 - 2⁹ = 138928567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138929009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23154844 + ... + 23154849.

It is an arithmetic number, because the mean of its divisors is an integer number (46309694).

Almost surely, 2^138929079 is an apocalyptic number.

138929079 is a deficient number, since it is larger than the sum of its proper divisors (46309697).

138929079 is an equidigital number, since it uses as much as digits as its factorization.

138929079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46309696.

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

The square root of 138929079 is about 11786.8180184476. The cubic root of 138929079 is about 517.9220315161.

The spelling of 138929079 in words is "one hundred thirty-eight million, nine hundred twenty-nine thousand, seventy-nine".