12399649 has 2 divisors, whose sum is σ = 12399650. Its totient is φ = 12399648.

The previous prime is 12399643. The next prime is 12399677. The reversal of 12399649 is 94699321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8910225 + 3489424 = 2985^2 + 1868^2 .

It is an emirp because it is prime and its reverse (94699321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12399649 is a prime.

It is not a weakly prime, because it can be changed into another prime (12399643) 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, 6199824 + 6199825.

It is an arithmetic number, because the mean of its divisors is an integer number (6199825).

Almost surely, 2^12399649 is an apocalyptic number.

It is an amenable number.

12399649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12399649 is an equidigital number, since it uses as much as digits as its factorization.

12399649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 12399649 is about 3521.3135333282. The cubic root of 12399649 is about 231.4567215052.

The spelling of 12399649 in words is "twelve million, three hundred ninety-nine thousand, six hundred forty-nine".