12779785 has 4 divisors (see below), whose sum is σ = 15335748. Its totient is φ = 10223824.

The previous prime is 12779783. The next prime is 12779821. The reversal of 12779785 is 58797721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4206601 + 8573184 = 2051^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 12779785 - 2¹ = 12779783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12779783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277974 + ... + 1277983.

It is an arithmetic number, because the mean of its divisors is an integer number (3833937).

Almost surely, 2^12779785 is an apocalyptic number.

It is an amenable number.

12779785 is a deficient number, since it is larger than the sum of its proper divisors (2555963).

12779785 is an equidigital number, since it uses as much as digits as its factorization.

12779785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555962.

The product of its digits is 246960, while the sum is 46.

The square root of 12779785 is about 3574.8825155521. The cubic root of 12779785 is about 233.7982103845.

The spelling of 12779785 in words is "twelve million, seven hundred seventy-nine thousand, seven hundred eighty-five".