12646999 has 4 divisors (see below), whose sum is σ = 12703936. Its totient is φ = 12590064.

The previous prime is 12646981. The next prime is 12647003. The reversal of 12646999 is 99964621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99964621 = 127 ⋅787123.

It is a cyclic number.

It is not a de Polignac number, because 12646999 - 2¹³ = 12638807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646919) 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 in 3 ways as a sum of consecutive naturals, for example, 28134 + ... + 28579.

It is an arithmetic number, because the mean of its divisors is an integer number (3175984).

Almost surely, 2^12646999 is an apocalyptic number.

12646999 is a deficient number, since it is larger than the sum of its proper divisors (56937).

12646999 is an equidigital number, since it uses as much as digits as its factorization.

12646999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56936.

The product of its digits is 209952, while the sum is 46.

The square root of 12646999 is about 3556.2619419835. The cubic root of 12646999 is about 232.9856438440.

The spelling of 12646999 in words is "twelve million, six hundred forty-six thousand, nine hundred ninety-nine".