12707809 has 4 divisors (see below), whose sum is σ = 12718080. Its totient is φ = 12697540.

The previous prime is 12707801. The next prime is 12707837. The reversal of 12707809 is 90870721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12707809 - 2³ = 12707801 is a prime.

It is a super-2 number, since 2×12707809² = 322976819160962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12707801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2977 + ... + 5854.

It is an arithmetic number, because the mean of its divisors is an integer number (3179520).

Almost surely, 2^12707809 is an apocalyptic number.

It is an amenable number.

12707809 is a deficient number, since it is larger than the sum of its proper divisors (10271).

12707809 is an equidigital number, since it uses as much as digits as its factorization.

12707809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 12707809 is about 3564.8013969925. The cubic root of 12707809 is about 233.3584650935.

The spelling of 12707809 in words is "twelve million, seven hundred seven thousand, eight hundred nine".