138731039 has 2 divisors, whose sum is σ = 138731040. Its totient is φ = 138731038.

The previous prime is 138730997. The next prime is 138731057. The reversal of 138731039 is 930137831.

138731039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138731039 - 2⁸ = 138730783 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138731839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69365519 + 69365520.

It is an arithmetic number, because the mean of its divisors is an integer number (69365520).

Almost surely, 2^138731039 is an apocalyptic number.

138731039 is a deficient number, since it is larger than the sum of its proper divisors (1).

138731039 is an equidigital number, since it uses as much as digits as its factorization.

138731039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 138731039 is about 11778.4141122649. The cubic root of 138731039 is about 517.6758194316.

The spelling of 138731039 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, thirty-nine".