12729439 has 2 divisors, whose sum is σ = 12729440. Its totient is φ = 12729438.

The previous prime is 12729391. The next prime is 12729491. The reversal of 12729439 is 93492721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12729439 - 2⁹ = 12728927 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12729398 and 12729407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12729239) 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, 6364719 + 6364720.

It is an arithmetic number, because the mean of its divisors is an integer number (6364720).

Almost surely, 2^12729439 is an apocalyptic number.

12729439 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729439 is an equidigital number, since it uses as much as digits as its factorization.

12729439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 12729439 is about 3567.8339367185. The cubic root of 12729439 is about 233.4907900938.

The spelling of 12729439 in words is "twelve million, seven hundred twenty-nine thousand, four hundred thirty-nine".