138557039 has 2 divisors, whose sum is σ = 138557040. Its totient is φ = 138557038.

The previous prime is 138557017. The next prime is 138557071. The reversal of 138557039 is 930755831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138557039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138556987 and 138557005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138557539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69278519 + 69278520.

It is an arithmetic number, because the mean of its divisors is an integer number (69278520).

Almost surely, 2^138557039 is an apocalyptic number.

138557039 is a deficient number, since it is larger than the sum of its proper divisors (1).

138557039 is an equidigital number, since it uses as much as digits as its factorization.

138557039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 138557039 is about 11771.0254013828. The cubic root of 138557039 is about 517.4593014895.

The spelling of 138557039 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, thirty-nine".