12447909 has 12 divisors (see below), whose sum is σ = 18146700. Its totient is φ = 8221824.

The previous prime is 12447901. The next prime is 12447937. The reversal of 12447909 is 90974421.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 7717284 = 2175^2 + 2778^2 .

It is not a de Polignac number, because 12447909 - 2³ = 12447901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447901) 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, 5364 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1512225).

Almost surely, 2^12447909 is an apocalyptic number.

It is an amenable number.

12447909 is a deficient number, since it is larger than the sum of its proper divisors (5698791).

12447909 is a wasteful number, since it uses less digits than its factorization.

12447909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804 (or 12801 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 12447909 is about 3528.1594351730. The cubic root of 12447909 is about 231.7566128198.

The spelling of 12447909 in words is "twelve million, four hundred forty-seven thousand, nine hundred nine".