12405539 has 2 divisors, whose sum is σ = 12405540. Its totient is φ = 12405538.

The previous prime is 12405521. The next prime is 12405541. The reversal of 12405539 is 93550421.

12405539 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12405539 is a prime.

Together with 12405541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12401539) 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 as a sum of consecutive naturals, namely, 6202769 + 6202770.

It is an arithmetic number, because the mean of its divisors is an integer number (6202770).

Almost surely, 2^12405539 is an apocalyptic number.

12405539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12405539 is an equidigital number, since it uses as much as digits as its factorization.

12405539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 12405539 is about 3522.1497696719. The cubic root of 12405539 is about 231.4933640555.

The spelling of 12405539 in words is "twelve million, four hundred five thousand, five hundred thirty-nine".