12809705 has 8 divisors (see below), whose sum is σ = 16180800. Its totient is φ = 9708336.

The previous prime is 12809701. The next prime is 12809711. The reversal of 12809705 is 50790821.

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 12809705 - 2² = 12809701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12809701) 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, 67325 + ... + 67514.

It is an arithmetic number, because the mean of its divisors is an integer number (2022600).

Almost surely, 2^12809705 is an apocalyptic number.

It is an amenable number.

12809705 is a deficient number, since it is larger than the sum of its proper divisors (3371095).

12809705 is a wasteful number, since it uses less digits than its factorization.

12809705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134863.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 12809705 is about 3579.0648219891. The cubic root of 12809705 is about 233.9805241053.

The spelling of 12809705 in words is "twelve million, eight hundred nine thousand, seven hundred five".