12564809 has 8 divisors (see below), whose sum is σ = 12755232. Its totient is φ = 12376000.

The previous prime is 12564803. The next prime is 12564821. The reversal of 12564809 is 90846521.

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

It is a cyclic number.

It is not a de Polignac number, because 12564809 - 2¹⁶ = 12499273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12564803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28142 + ... + 28584.

It is an arithmetic number, because the mean of its divisors is an integer number (1594404).

Almost surely, 2^12564809 is an apocalyptic number.

It is an amenable number.

12564809 is a deficient number, since it is larger than the sum of its proper divisors (190423).

12564809 is a wasteful number, since it uses less digits than its factorization.

12564809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 12564809 is about 3544.6874333289. The cubic root of 12564809 is about 232.4798394667.

The spelling of 12564809 in words is "twelve million, five hundred sixty-four thousand, eight hundred nine".