12660309 has 6 divisors (see below), whose sum is σ = 18287126. Its totient is φ = 8440200.

The previous prime is 12660301. The next prime is 12660331. The reversal of 12660309 is 90306621.

It is a happy number.

12660309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9474084 + 3186225 = 3078^2 + 1785^2 .

It is not a de Polignac number, because 12660309 - 2³ = 12660301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660301) 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 in 5 ways as a sum of consecutive naturals, for example, 703342 + ... + 703359.

Almost surely, 2^12660309 is an apocalyptic number.

It is an amenable number.

12660309 is a deficient number, since it is larger than the sum of its proper divisors (5626817).

12660309 is a wasteful number, since it uses less digits than its factorization.

12660309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406707 (or 1406704 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 12660309 is about 3558.1327968472. The cubic root of 12660309 is about 233.0673483834.

The spelling of 12660309 in words is "twelve million, six hundred sixty thousand, three hundred nine".