12247209 has 12 divisors (see below), whose sum is σ = 19051396. Its totient is φ = 7536672.

The previous prime is 12247199. The next prime is 12247211. The reversal of 12247209 is 90274221.

12247209 is digitally balanced in base 2, 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 2 ways, for example, as 6487209 + 5760000 = 2547^2 + 2400^2 .

It is not a de Polignac number, because 12247209 - 2⁵ = 12247177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12247289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52222 + ... + 52455.

Almost surely, 2^12247209 is an apocalyptic number.

It is an amenable number.

12247209 is a deficient number, since it is larger than the sum of its proper divisors (6804187).

12247209 is a wasteful number, since it uses less digits than its factorization.

12247209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104696 (or 104693 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 12247209 is about 3499.6012630013. The cubic root of 12247209 is about 230.5043061607.

The spelling of 12247209 in words is "twelve million, two hundred forty-seven thousand, two hundred nine".