12709409 has 4 divisors (see below), whose sum is σ = 13262016. Its totient is φ = 12156804.

The previous prime is 12709397. The next prime is 12709427. The reversal of 12709409 is 90490721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12709409 - 2⁴ = 12709393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12709009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276269 + ... + 276314.

It is an arithmetic number, because the mean of its divisors is an integer number (3315504).

Almost surely, 2^12709409 is an apocalyptic number.

It is an amenable number.

12709409 is a deficient number, since it is larger than the sum of its proper divisors (552607).

12709409 is an equidigital number, since it uses as much as digits as its factorization.

12709409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552606.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 12709409 is about 3565.0258063582. The cubic root of 12709409 is about 233.3682584910.

The spelling of 12709409 in words is "twelve million, seven hundred nine thousand, four hundred nine".