12781823 has 2 divisors, whose sum is σ = 12781824. Its totient is φ = 12781822.

The previous prime is 12781817. The next prime is 12781843. The reversal of 12781823 is 32818721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12781823 - 2⁸ = 12781567 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12781823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781843) 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, 6390911 + 6390912.

It is an arithmetic number, because the mean of its divisors is an integer number (6390912).

Almost surely, 2^12781823 is an apocalyptic number.

12781823 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781823 is an equidigital number, since it uses as much as digits as its factorization.

12781823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 12781823 is about 3575.1675485213. The cubic root of 12781823 is about 233.8106377044.

The spelling of 12781823 in words is "twelve million, seven hundred eighty-one thousand, eight hundred twenty-three".