138833239 has 2 divisors, whose sum is σ = 138833240. Its totient is φ = 138833238.

The previous prime is 138833183. The next prime is 138833263. The reversal of 138833239 is 932338831.

138833239 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 an emirp because it is prime and its reverse (932338831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138833239 - 2¹¹ = 138831191 is a prime.

It is a super-2 number, since 2×138833239² = 38549336502462242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138833039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69416619 + 69416620.

It is an arithmetic number, because the mean of its divisors is an integer number (69416620).

Almost surely, 2^138833239 is an apocalyptic number.

138833239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138833239 is an equidigital number, since it uses as much as digits as its factorization.

138833239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 138833239 is about 11782.7517583967. The cubic root of 138833239 is about 517.8029082282.

The spelling of 138833239 in words is "one hundred thirty-eight million, eight hundred thirty-three thousand, two hundred thirty-nine".