12809665 has 24 divisors (see below), whose sum is σ = 17466624. Its totient is φ = 9002400.

The previous prime is 12809647. The next prime is 12809701. The reversal of 12809665 is 56690821.

12809665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12809665 - 2⁵ = 12809633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18414 + ... + 19096.

It is an arithmetic number, because the mean of its divisors is an integer number (727776).

Almost surely, 2^12809665 is an apocalyptic number.

It is an amenable number.

12809665 is a deficient number, since it is larger than the sum of its proper divisors (4656959).

12809665 is a wasteful number, since it uses less digits than its factorization.

12809665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 12809665 is about 3579.0592339329. The cubic root of 12809665 is about 233.9802805600.

The spelling of 12809665 in words is "twelve million, eight hundred nine thousand, six hundred sixty-five".