138234839 has 2 divisors, whose sum is σ = 138234840. Its totient is φ = 138234838.

The previous prime is 138234827. The next prime is 138234841. The reversal of 138234839 is 938432831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138234839 - 2⁸ = 138234583 is a prime.

Together with 138234841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138234796 and 138234805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138233839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69117419 + 69117420.

It is an arithmetic number, because the mean of its divisors is an integer number (69117420).

Almost surely, 2^138234839 is an apocalyptic number.

138234839 is a deficient number, since it is larger than the sum of its proper divisors (1).

138234839 is an equidigital number, since it uses as much as digits as its factorization.

138234839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 138234839 is about 11757.3312873288. The cubic root of 138234839 is about 517.0578908994.

The spelling of 138234839 in words is "one hundred thirty-eight million, two hundred thirty-four thousand, eight hundred thirty-nine".