12540831 has 4 divisors (see below), whose sum is σ = 16721112. Its totient is φ = 8360552.

The previous prime is 12540811. The next prime is 12540877. The reversal of 12540831 is 13804521.

12540831 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13804521 = 3 ⋅4601507.

It is a cyclic number.

It is not a de Polignac number, because 12540831 - 2⁵ = 12540799 is a prime.

It is a super-2 number, since 2×12540831² = 314544884341122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540811) 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, 2090136 + ... + 2090141.

It is an arithmetic number, because the mean of its divisors is an integer number (4180278).

Almost surely, 2^12540831 is an apocalyptic number.

12540831 is a deficient number, since it is larger than the sum of its proper divisors (4180281).

12540831 is an equidigital number, since it uses as much as digits as its factorization.

12540831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180280.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 12540831 is about 3541.3035735446. The cubic root of 12540831 is about 232.3318613235.

The spelling of 12540831 in words is "twelve million, five hundred forty thousand, eight hundred thirty-one".