12739691 has 2 divisors, whose sum is σ = 12739692. Its totient is φ = 12739690.

The previous prime is 12739687. The next prime is 12739703. The reversal of 12739691 is 19693721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12739691 - 2² = 12739687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12739651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6369845 + 6369846.

It is an arithmetic number, because the mean of its divisors is an integer number (6369846).

Almost surely, 2^12739691 is an apocalyptic number.

12739691 is a deficient number, since it is larger than the sum of its proper divisors (1).

12739691 is an equidigital number, since it uses as much as digits as its factorization.

12739691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 12739691 is about 3569.2703736198. The cubic root of 12739691 is about 233.5534559936.

The spelling of 12739691 in words is "twelve million, seven hundred thirty-nine thousand, six hundred ninety-one".