12840456791 has 4 divisors (see below), whose sum is σ = 12847783392. Its totient is φ = 12833130192.

The previous prime is 12840456763. The next prime is 12840456809. The reversal of 12840456791 is 19765404821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12840456791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840456731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660671 + ... + 3664176.

It is an arithmetic number, because the mean of its divisors is an integer number (3211945848).

Almost surely, 2^12840456791 is an apocalyptic number.

12840456791 is a deficient number, since it is larger than the sum of its proper divisors (7326601).

12840456791 is an equidigital number, since it uses as much as digits as its factorization.

12840456791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326600.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 12840456791 in words is "twelve billion, eight hundred forty million, four hundred fifty-six thousand, seven hundred ninety-one".