12665409 has 8 divisors (see below), whose sum is σ = 16923840. Its totient is φ = 8425296.

The previous prime is 12665407. The next prime is 12665413. The reversal of 12665409 is 90456621.

12665409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12665409 - 2¹ = 12665407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665409.

It is not an unprimeable number, because it can be changed into a prime (12665407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2874 + ... + 5795.

It is an arithmetic number, because the mean of its divisors is an integer number (2115480).

Almost surely, 2^12665409 is an apocalyptic number.

It is an amenable number.

12665409 is a deficient number, since it is larger than the sum of its proper divisors (4258431).

12665409 is an equidigital number, since it uses as much as digits as its factorization.

12665409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9159.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 12665409 is about 3558.8493927111. The cubic root of 12665409 is about 233.0986399816.

The spelling of 12665409 in words is "twelve million, six hundred sixty-five thousand, four hundred nine".