12426809 has 4 divisors (see below), whose sum is σ = 12434916. Its totient is φ = 12418704.

The previous prime is 12426793. The next prime is 12426811. The reversal of 12426809 is 90862421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3258025 + 9168784 = 1805^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 12426809 - 2⁴ = 12426793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12426829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974 + ... + 5079.

It is an arithmetic number, because the mean of its divisors is an integer number (3108729).

Almost surely, 2^12426809 is an apocalyptic number.

It is an amenable number.

12426809 is a deficient number, since it is larger than the sum of its proper divisors (8107).

12426809 is an equidigital number, since it uses as much as digits as its factorization.

12426809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 12426809 is about 3525.1679392619. The cubic root of 12426809 is about 231.6255913466.

The spelling of 12426809 in words is "twelve million, four hundred twenty-six thousand, eight hundred nine".