12774809 has 4 divisors (see below), whose sum is σ = 12783204. Its totient is φ = 12766416.

The previous prime is 12774787. The next prime is 12774829. The reversal of 12774809 is 90847721.

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 193600 + 12581209 = 440^2 + 3547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12774809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12774829) 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, 1202 + ... + 5195.

It is an arithmetic number, because the mean of its divisors is an integer number (3195801).

Almost surely, 2^12774809 is an apocalyptic number.

It is an amenable number.

12774809 is a deficient number, since it is larger than the sum of its proper divisors (8395).

12774809 is an equidigital number, since it uses as much as digits as its factorization.

12774809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8394.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 12774809 is about 3574.1864808653. The cubic root of 12774809 is about 233.7678621713.

The spelling of 12774809 in words is "twelve million, seven hundred seventy-four thousand, eight hundred nine".