12135439 has 4 divisors (see below), whose sum is σ = 12165520. Its totient is φ = 12105360.

The previous prime is 12135413. The next prime is 12135443. The reversal of 12135439 is 93453121.

12135439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12135439 - 2¹¹ = 12133391 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 (12135469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14427 + ... + 15244.

It is an arithmetic number, because the mean of its divisors is an integer number (3041380).

Almost surely, 2^12135439 is an apocalyptic number.

12135439 is a deficient number, since it is larger than the sum of its proper divisors (30081).

12135439 is an equidigital number, since it uses as much as digits as its factorization.

12135439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30080.

The product of its digits is 3240, while the sum is 28.

The square root of 12135439 is about 3483.5956998481. The cubic root of 12135439 is about 229.8009557091.

The spelling of 12135439 in words is "twelve million, one hundred thirty-five thousand, four hundred thirty-nine".