12840681 has 32 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 7061184.

The previous prime is 12840679. The next prime is 12840689. The reversal of 12840681 is 18604821.

It is not a de Polignac number, because 12840681 - 2¹ = 12840679 is a prime.

It is a super-2 number, since 2×12840681² = 329766177087522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12840689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92310 + ... + 92448.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^12840681 is an apocalyptic number.

It is an amenable number.

12840681 is a deficient number, since it is larger than the sum of its proper divisors (7480599).

12840681 is a wasteful number, since it uses less digits than its factorization.

12840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 12840681 is about 3583.3895964575. The cubic root of 12840681 is about 234.1689735775.

The spelling of 12840681 in words is "twelve million, eight hundred forty thousand, six hundred eighty-one".