138926317 has 4 divisors (see below), whose sum is σ = 139811356. Its totient is φ = 138041280.

The previous prime is 138926299. The next prime is 138926321. The reversal of 138926317 is 713629831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36228361 + 102697956 = 6019^2 + 10134^2 .

It is a cyclic number.

It is not a de Polignac number, because 138926317 - 2²⁷ = 4708589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138926317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138926377) 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, 442284 + ... + 442597.

It is an arithmetic number, because the mean of its divisors is an integer number (34952839).

Almost surely, 2^138926317 is an apocalyptic number.

It is an amenable number.

138926317 is a deficient number, since it is larger than the sum of its proper divisors (885039).

138926317 is an equidigital number, since it uses as much as digits as its factorization.

138926317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885038.

The product of its digits is 54432, while the sum is 40.

The square root of 138926317 is about 11786.7008530801. The cubic root of 138926317 is about 517.9185992850.

The spelling of 138926317 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, three hundred seventeen".