12135239 has 4 divisors (see below), whose sum is σ = 12271680. Its totient is φ = 11998800.

The previous prime is 12135217. The next prime is 12135257. The reversal of 12135239 is 93253121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12135239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135289) 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 in 3 ways as a sum of consecutive naturals, for example, 68087 + ... + 68264.

It is an arithmetic number, because the mean of its divisors is an integer number (3067920).

Almost surely, 2^12135239 is an apocalyptic number.

12135239 is a deficient number, since it is larger than the sum of its proper divisors (136441).

12135239 is an equidigital number, since it uses as much as digits as its factorization.

12135239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136440.

The product of its digits is 1620, while the sum is 26.

The square root of 12135239 is about 3483.5669937580. The cubic root of 12135239 is about 229.7996932786.

The spelling of 12135239 in words is "twelve million, one hundred thirty-five thousand, two hundred thirty-nine".