135986239 has 2 divisors, whose sum is σ = 135986240. Its totient is φ = 135986238.

The previous prime is 135986237. The next prime is 135986251. The reversal of 135986239 is 932689531.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 135986239 - 2¹ = 135986237 is a prime.

Together with 135986237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135986233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67993119 + 67993120.

It is an arithmetic number, because the mean of its divisors is an integer number (67993120).

Almost surely, 2^135986239 is an apocalyptic number.

135986239 is a deficient number, since it is larger than the sum of its proper divisors (1).

135986239 is an equidigital number, since it uses as much as digits as its factorization.

135986239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 46.

The square root of 135986239 is about 11661.3137767577. The cubic root of 135986239 is about 514.2389727398.

The spelling of 135986239 in words is "one hundred thirty-five million, nine hundred eighty-six thousand, two hundred thirty-nine".