12447309 has 16 divisors (see below), whose sum is σ = 19023488. Its totient is φ = 7091712.

The previous prime is 12447287. The next prime is 12447329. The reversal of 12447309 is 90374421.

It is a happy number.

It is not a de Polignac number, because 12447309 - 2⁵ = 12447277 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8949 + ... + 10245.

It is an arithmetic number, because the mean of its divisors is an integer number (1188968).

Almost surely, 2^12447309 is an apocalyptic number.

It is an amenable number.

12447309 is a deficient number, since it is larger than the sum of its proper divisors (6576179).

12447309 is a wasteful number, since it uses less digits than its factorization.

12447309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 12447309 is about 3528.0744039773. The cubic root of 12447309 is about 231.7528891368.

The spelling of 12447309 in words is "twelve million, four hundred forty-seven thousand, three hundred nine".