135942239 has 2 divisors, whose sum is σ = 135942240. Its totient is φ = 135942238.

The previous prime is 135942211. The next prime is 135942241. The reversal of 135942239 is 932249531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135942239 - 2²⁰ = 134893663 is a prime.

Together with 135942241, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135942269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67971119 + 67971120.

It is an arithmetic number, because the mean of its divisors is an integer number (67971120).

Almost surely, 2^135942239 is an apocalyptic number.

135942239 is a deficient number, since it is larger than the sum of its proper divisors (1).

135942239 is an equidigital number, since it uses as much as digits as its factorization.

135942239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 38.

The square root of 135942239 is about 11659.4270442419. The cubic root of 135942239 is about 514.1835040008.

The spelling of 135942239 in words is "one hundred thirty-five million, nine hundred forty-two thousand, two hundred thirty-nine".