12668939 has 2 divisors, whose sum is σ = 12668940. Its totient is φ = 12668938.

The previous prime is 12668933. The next prime is 12668941. The reversal of 12668939 is 93986621.

It is a strong prime.

It is an emirp because it is prime and its reverse (93986621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12668939 is a prime.

Together with 12668941, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12668939.

It is not a weakly prime, because it can be changed into another prime (12668933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6334469 + 6334470.

It is an arithmetic number, because the mean of its divisors is an integer number (6334470).

Almost surely, 2^12668939 is an apocalyptic number.

12668939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12668939 is an equidigital number, since it uses as much as digits as its factorization.

12668939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 12668939 is about 3559.3453049683. The cubic root of 12668939 is about 233.1202937570.

The spelling of 12668939 in words is "twelve million, six hundred sixty-eight thousand, nine hundred thirty-nine".