12309209 has 12 divisors (see below), whose sum is σ = 14121408. Its totient is φ = 10701240.

The previous prime is 12309191. The next prime is 12309233. The reversal of 12309209 is 90290321.

It is not a de Polignac number, because 12309209 - 2¹² = 12305113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12309239) 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, 572 + ... + 4994.

It is an arithmetic number, because the mean of its divisors is an integer number (1176784).

Almost surely, 2^12309209 is an apocalyptic number.

It is an amenable number.

12309209 is a deficient number, since it is larger than the sum of its proper divisors (1812199).

12309209 is a wasteful number, since it uses less digits than its factorization.

12309209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468 (or 4457 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 12309209 is about 3508.4482324811. The cubic root of 12309209 is about 230.8926182691.

The spelling of 12309209 in words is "twelve million, three hundred nine thousand, two hundred nine".