12729779 has 2 divisors, whose sum is σ = 12729780. Its totient is φ = 12729778.

The previous prime is 12729727. The next prime is 12729797. The reversal of 12729779 is 97792721.

Together with next prime (12729797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12729779 is a prime.

It is a super-3 number, since 3×12729779³ (a number of 22 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12729709) 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, 6364889 + 6364890.

It is an arithmetic number, because the mean of its divisors is an integer number (6364890).

Almost surely, 2^12729779 is an apocalyptic number.

12729779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12729779 is an equidigital number, since it uses as much as digits as its factorization.

12729779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111132, while the sum is 44.

The square root of 12729779 is about 3567.8815843579. The cubic root of 12729779 is about 233.4928689014.

The spelling of 12729779 in words is "twelve million, seven hundred twenty-nine thousand, seven hundred seventy-nine".