12945239 has 2 divisors, whose sum is σ = 12945240. Its totient is φ = 12945238.

The previous prime is 12945221. The next prime is 12945241. The reversal of 12945239 is 93254921.

It is a strong prime.

It is an emirp because it is prime and its reverse (93254921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12945239 - 2²⁰ = 11896663 is a prime.

Together with 12945241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12945199 and 12945208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12945739) 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, 6472619 + 6472620.

It is an arithmetic number, because the mean of its divisors is an integer number (6472620).

Almost surely, 2^12945239 is an apocalyptic number.

12945239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12945239 is an equidigital number, since it uses as much as digits as its factorization.

12945239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 12945239 is about 3597.9492770188. The cubic root of 12945239 is about 234.8028465652.

The spelling of 12945239 in words is "twelve million, nine hundred forty-five thousand, two hundred thirty-nine".