138938713 has 2 divisors, whose sum is σ = 138938714. Its totient is φ = 138938712.

The previous prime is 138938641. The next prime is 138938729. The reversal of 138938713 is 317839831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111344704 + 27594009 = 10552^2 + 5253^2 .

It is a cyclic number.

It is not a de Polignac number, because 138938713 - 2⁹ = 138938201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138938713.

It is not a weakly prime, because it can be changed into another prime (138938753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69469356 + 69469357.

It is an arithmetic number, because the mean of its divisors is an integer number (69469357).

Almost surely, 2^138938713 is an apocalyptic number.

It is an amenable number.

138938713 is a deficient number, since it is larger than the sum of its proper divisors (1).

138938713 is an equidigital number, since it uses as much as digits as its factorization.

138938713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 138938713 is about 11787.2266882418. The cubic root of 138938713 is about 517.9340029612.

The spelling of 138938713 in words is "one hundred thirty-eight million, nine hundred thirty-eight thousand, seven hundred thirteen".