138778713 has 12 divisors (see below), whose sum is σ = 200799508. Its totient is φ = 92361600.

The previous prime is 138778699. The next prime is 138778729. The reversal of 138778713 is 317877831.

It can be written as a sum of positive squares in 2 ways, for example, as 81216144 + 57562569 = 9012^2 + 7587^2 .

It is not a de Polignac number, because 138778713 - 2⁵ = 138778681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138778763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7420 + ... + 18237.

Almost surely, 2^138778713 is an apocalyptic number.

It is an amenable number.

138778713 is a deficient number, since it is larger than the sum of its proper divisors (62020795).

138778713 is a wasteful number, since it uses less digits than its factorization.

138778713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26264 (or 26261 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 138778713 is about 11780.4377253139. The cubic root of 138778713 is about 517.7351112592.

The spelling of 138778713 in words is "one hundred thirty-eight million, seven hundred seventy-eight thousand, seven hundred thirteen".