12247309 has 4 divisors (see below), whose sum is σ = 12669660. Its totient is φ = 11824960.

The previous prime is 12247297. The next prime is 12247357. The reversal of 12247309 is 90374221.

12247309 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1988100 + 10259209 = 1410^2 + 3203^2 .

It is a cyclic number.

It is not a de Polignac number, because 12247309 - 2⁷ = 12247181 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 (12247369) 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, 211132 + ... + 211189.

It is an arithmetic number, because the mean of its divisors is an integer number (3167415).

Almost surely, 2^12247309 is an apocalyptic number.

It is an amenable number.

12247309 is a deficient number, since it is larger than the sum of its proper divisors (422351).

12247309 is an equidigital number, since it uses as much as digits as its factorization.

12247309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422350.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 12247309 is about 3499.6155503141. The cubic root of 12247309 is about 230.5049335245.

The spelling of 12247309 in words is "twelve million, two hundred forty-seven thousand, three hundred nine".