138079907 has 4 divisors (see below), whose sum is σ = 157805616. Its totient is φ = 118354200.

The previous prime is 138079891. The next prime is 138079951. The reversal of 138079907 is 709970831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 709970831 = 23 ⋅30868297.

It is a cyclic number.

It is not a de Polignac number, because 138079907 - 2⁴ = 138079891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138079307) 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, 9862844 + ... + 9862857.

It is an arithmetic number, because the mean of its divisors is an integer number (39451404).

Almost surely, 2^138079907 is an apocalyptic number.

138079907 is a deficient number, since it is larger than the sum of its proper divisors (19725709).

138079907 is an equidigital number, since it uses as much as digits as its factorization.

138079907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19725708.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 138079907 is about 11750.7407000580. The cubic root of 138079907 is about 516.8646478629.

The spelling of 138079907 in words is "one hundred thirty-eight million, seventy-nine thousand, nine hundred seven".