12647819 has 2 divisors, whose sum is σ = 12647820. Its totient is φ = 12647818.

The previous prime is 12647777. The next prime is 12647827. The reversal of 12647819 is 91874621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12647819 - 2⁸ = 12647563 is a prime.

It is a super-4 number, since 4×12647819⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12647849) 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, 6323909 + 6323910.

It is an arithmetic number, because the mean of its divisors is an integer number (6323910).

Almost surely, 2^12647819 is an apocalyptic number.

12647819 is a deficient number, since it is larger than the sum of its proper divisors (1).

12647819 is an equidigital number, since it uses as much as digits as its factorization.

12647819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 12647819 is about 3556.3772297100. The cubic root of 12647819 is about 232.9906791386.

The spelling of 12647819 in words is "twelve million, six hundred forty-seven thousand, eight hundred nineteen".