138584239 has 2 divisors, whose sum is σ = 138584240. Its totient is φ = 138584238.

The previous prime is 138584219. The next prime is 138584263. The reversal of 138584239 is 932485831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138584239 - 2⁷ = 138584111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138584195 and 138584204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138584209) 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 as a sum of consecutive naturals, namely, 69292119 + 69292120.

It is an arithmetic number, because the mean of its divisors is an integer number (69292120).

Almost surely, 2^138584239 is an apocalyptic number.

138584239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138584239 is an equidigital number, since it uses as much as digits as its factorization.

138584239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 138584239 is about 11772.1807240630. The cubic root of 138584239 is about 517.4931599211.

The spelling of 138584239 in words is "one hundred thirty-eight million, five hundred eighty-four thousand, two hundred thirty-nine".