12778774 has 4 divisors (see below), whose sum is σ = 19168164. Its totient is φ = 6389386.

The previous prime is 12778771. The next prime is 12778813. The reversal of 12778774 is 47787721.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12778774.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778771) 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 as a sum of consecutive naturals, namely, 3194692 + ... + 3194695.

It is an arithmetic number, because the mean of its divisors is an integer number (4792041).

Almost surely, 2^12778774 is an apocalyptic number.

12778774 is a deficient number, since it is larger than the sum of its proper divisors (6389390).

12778774 is an equidigital number, since it uses as much as digits as its factorization.

12778774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6389389.

The product of its digits is 153664, while the sum is 43.

The square root of 12778774 is about 3574.7411095071. The cubic root of 12778774 is about 233.7920450167.

The spelling of 12778774 in words is "twelve million, seven hundred seventy-eight thousand, seven hundred seventy-four".