12540823 has 4 divisors (see below), whose sum is σ = 12604680. Its totient is φ = 12476968.

The previous prime is 12540811. The next prime is 12540877. The reversal of 12540823 is 32804521.

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

It is a cyclic number.

It is not a de Polignac number, because 12540823 - 2⁵ = 12540791 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 (12540623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31633 + ... + 32026.

It is an arithmetic number, because the mean of its divisors is an integer number (3151170).

Almost surely, 2^12540823 is an apocalyptic number.

12540823 is a deficient number, since it is larger than the sum of its proper divisors (63857).

12540823 is an equidigital number, since it uses as much as digits as its factorization.

12540823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63856.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 12540823 is about 3541.3024440169. The cubic root of 12540823 is about 232.3318119207.

The spelling of 12540823 in words is "twelve million, five hundred forty thousand, eight hundred twenty-three".