12739966 has 4 divisors (see below), whose sum is σ = 19109952. Its totient is φ = 6369982.

The previous prime is 12739943. The next prime is 12739973. The reversal of 12739966 is 66993721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66993721 = 229 ⋅292549.

It is a congruent number.

It is an unprimeable number.

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, 3184990 + ... + 3184993.

It is an arithmetic number, because the mean of its divisors is an integer number (4777488).

Almost surely, 2^12739966 is an apocalyptic number.

12739966 is a deficient number, since it is larger than the sum of its proper divisors (6369986).

12739966 is an equidigital number, since it uses as much as digits as its factorization.

12739966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369985.

The product of its digits is 122472, while the sum is 43.

The square root of 12739966 is about 3569.3088966913. The cubic root of 12739966 is about 233.5551364828. Note that the first 3 decimals are identical.

The spelling of 12739966 in words is "twelve million, seven hundred thirty-nine thousand, nine hundred sixty-six".