12928439 has 2 divisors, whose sum is σ = 12928440. Its totient is φ = 12928438.

The previous prime is 12928427. The next prime is 12928459. The reversal of 12928439 is 93482921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12928439 - 2⁸ = 12928183 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12928459) 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, 6464219 + 6464220.

It is an arithmetic number, because the mean of its divisors is an integer number (6464220).

Almost surely, 2^12928439 is an apocalyptic number.

12928439 is a deficient number, since it is larger than the sum of its proper divisors (1).

12928439 is an equidigital number, since it uses as much as digits as its factorization.

12928439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 12928439 is about 3595.6138557971. The cubic root of 12928439 is about 234.7012288844.

The spelling of 12928439 in words is "twelve million, nine hundred twenty-eight thousand, four hundred thirty-nine".