12660709 has 4 divisors (see below), whose sum is σ = 12669004. Its totient is φ = 12652416.

The previous prime is 12660671. The next prime is 12660721. The reversal of 12660709 is 90706621.

12660709 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90706621 = 521 ⋅174101.

It can be written as a sum of positive squares in 2 ways, for example, as 11710084 + 950625 = 3422^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 12660709 - 2¹³ = 12652517 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 (12660749) 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, 1122 + ... + 5155.

It is an arithmetic number, because the mean of its divisors is an integer number (3167251).

Almost surely, 2^12660709 is an apocalyptic number.

It is an amenable number.

12660709 is a deficient number, since it is larger than the sum of its proper divisors (8295).

12660709 is an equidigital number, since it uses as much as digits as its factorization.

12660709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 12660709 is about 3558.1890056600. The cubic root of 12660709 is about 233.0698029301.

The spelling of 12660709 in words is "twelve million, six hundred sixty thousand, seven hundred nine".