138859739 has 2 divisors, whose sum is σ = 138859740. Its totient is φ = 138859738.

The previous prime is 138859727. The next prime is 138859769. The reversal of 138859739 is 937958831.

It is a happy number.

138859739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138859739 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138859709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69429869 + 69429870.

It is an arithmetic number, because the mean of its divisors is an integer number (69429870).

Almost surely, 2^138859739 is an apocalyptic number.

138859739 is a deficient number, since it is larger than the sum of its proper divisors (1).

138859739 is an equidigital number, since it uses as much as digits as its factorization.

138859739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 138859739 is about 11783.8762298320. The cubic root of 138859739 is about 517.8358515978.

The spelling of 138859739 in words is "one hundred thirty-eight million, eight hundred fifty-nine thousand, seven hundred thirty-nine".