12966649 has 4 divisors (see below), whose sum is σ = 13384960. Its totient is φ = 12548340.

The previous prime is 12966643. The next prime is 12966661. The reversal of 12966649 is 94666921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12966649 - 2⁵ = 12966617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12966643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209109 + ... + 209170.

It is an arithmetic number, because the mean of its divisors is an integer number (3346240).

Almost surely, 2^12966649 is an apocalyptic number.

It is an amenable number.

12966649 is a deficient number, since it is larger than the sum of its proper divisors (418311).

12966649 is an equidigital number, since it uses as much as digits as its factorization.

12966649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418310.

The product of its digits is 139968, while the sum is 43.

The square root of 12966649 is about 3600.9233538080. The cubic root of 12966649 is about 234.9322212861.

The spelling of 12966649 in words is "twelve million, nine hundred sixty-six thousand, six hundred forty-nine".