12781814 has 4 divisors (see below), whose sum is σ = 19172724. Its totient is φ = 6390906.

The previous prime is 12781799. The next prime is 12781817. The reversal of 12781814 is 41818721.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781817) 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 as a sum of consecutive naturals, namely, 3195452 + ... + 3195455.

It is an arithmetic number, because the mean of its divisors is an integer number (4793181).

Almost surely, 2^12781814 is an apocalyptic number.

12781814 is a deficient number, since it is larger than the sum of its proper divisors (6390910).

12781814 is an equidigital number, since it uses as much as digits as its factorization.

12781814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6390909.

The product of its digits is 3584, while the sum is 32.

The square root of 12781814 is about 3575.1662898388. The cubic root of 12781814 is about 233.8105828270.

The spelling of 12781814 in words is "twelve million, seven hundred eighty-one thousand, eight hundred fourteen".