12540681 has 24 divisors (see below), whose sum is σ = 19319040. Its totient is φ = 7820736.

The previous prime is 12540677. The next prime is 12540691. The reversal of 12540681 is 18604521.

12540681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12540681 - 2² = 12540677 is a prime.

It is a super-2 number, since 2×12540681² = 314537359887522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12540601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9085 + ... + 10373.

It is an arithmetic number, because the mean of its divisors is an integer number (804960).

Almost surely, 2^12540681 is an apocalyptic number.

It is an amenable number.

12540681 is a deficient number, since it is larger than the sum of its proper divisors (6778359).

12540681 is a wasteful number, since it uses less digits than its factorization.

12540681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12540681 is about 3541.2823948395. The cubic root of 12540681 is about 232.3309350181.

The spelling of 12540681 in words is "twelve million, five hundred forty thousand, six hundred eighty-one".