12456539 has 2 divisors, whose sum is σ = 12456540. Its totient is φ = 12456538.

The previous prime is 12456527. The next prime is 12456581. The reversal of 12456539 is 93565421.

It is a weak prime.

It is an emirp because it is prime and its reverse (93565421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12456539 - 2¹² = 12452443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12456499 and 12456508.

It is not a weakly prime, because it can be changed into another prime (12450539) 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, 6228269 + 6228270.

It is an arithmetic number, because the mean of its divisors is an integer number (6228270).

Almost surely, 2^12456539 is an apocalyptic number.

12456539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12456539 is an equidigital number, since it uses as much as digits as its factorization.

12456539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 35.

The square root of 12456539 is about 3529.3822405628. The cubic root of 12456539 is about 231.8101585610.

The spelling of 12456539 in words is "twelve million, four hundred fifty-six thousand, five hundred thirty-nine".