138328079 has 4 divisors (see below), whose sum is σ = 138640776. Its totient is φ = 138015384.

The previous prime is 138328067. The next prime is 138328087. The reversal of 138328079 is 970823831.

138328079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138328079 - 2⁴ = 138328063 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 (138325079) 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, 155684 + ... + 156569.

It is an arithmetic number, because the mean of its divisors is an integer number (34660194).

Almost surely, 2^138328079 is an apocalyptic number.

138328079 is a deficient number, since it is larger than the sum of its proper divisors (312697).

138328079 is an equidigital number, since it uses as much as digits as its factorization.

138328079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312696.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 138328079 is about 11761.2958044596. The cubic root of 138328079 is about 517.1741173702.

The spelling of 138328079 in words is "one hundred thirty-eight million, three hundred twenty-eight thousand, seventy-nine".