12456839 has 4 divisors (see below), whose sum is σ = 12476856. Its totient is φ = 12436824.

The previous prime is 12456817. The next prime is 12456877. The reversal of 12456839 is 93865421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93865421 = 13 ⋅7220417.

It is a cyclic number.

It is not a de Polignac number, because 12456839 - 2¹² = 12452743 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 (12456539) 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, 9044 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (3119214).

Almost surely, 2^12456839 is an apocalyptic number.

12456839 is a deficient number, since it is larger than the sum of its proper divisors (20017).

12456839 is an equidigital number, since it uses as much as digits as its factorization.

12456839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20016.

The product of its digits is 51840, while the sum is 38.

The square root of 12456839 is about 3529.4247406624. The cubic root of 12456839 is about 231.8120194976.

The spelling of 12456839 in words is "twelve million, four hundred fifty-six thousand, eight hundred thirty-nine".