138458239 has 2 divisors, whose sum is σ = 138458240. Its totient is φ = 138458238.

The previous prime is 138458171. The next prime is 138458261. The reversal of 138458239 is 932854831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138458239 - 2⁹ = 138457727 is a prime.

It is a super-2 number, since 2×138458239² = 38341367893962242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138458195 and 138458204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138458269) 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, 69229119 + 69229120.

It is an arithmetic number, because the mean of its divisors is an integer number (69229120).

Almost surely, 2^138458239 is an apocalyptic number.

138458239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138458239 is an equidigital number, since it uses as much as digits as its factorization.

138458239 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 138458239 is about 11766.8279072994. The cubic root of 138458239 is about 517.3362784227.

The spelling of 138458239 in words is "one hundred thirty-eight million, four hundred fifty-eight thousand, two hundred thirty-nine".