12920839 has 2 divisors, whose sum is σ = 12920840. Its totient is φ = 12920838.

The previous prime is 12920827. The next prime is 12920857. The reversal of 12920839 is 93802921.

12920839 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (93802921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12920839 - 2¹⁷ = 12789767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12920819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460419 + 6460420.

It is an arithmetic number, because the mean of its divisors is an integer number (6460420).

Almost surely, 2^12920839 is an apocalyptic number.

12920839 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920839 is an equidigital number, since it uses as much as digits as its factorization.

12920839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 12920839 is about 3594.5568572496. The cubic root of 12920839 is about 234.6552300603.

The spelling of 12920839 in words is "twelve million, nine hundred twenty thousand, eight hundred thirty-nine".