12540243 has 4 divisors (see below), whose sum is σ = 16720328. Its totient is φ = 8360160.

The previous prime is 12540217. The next prime is 12540259. The reversal of 12540243 is 34204521.

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

It is not a de Polignac number, because 12540243 - 2⁸ = 12539987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12540263) 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, 2090038 + ... + 2090043.

It is an arithmetic number, because the mean of its divisors is an integer number (4180082).

Almost surely, 2^12540243 is an apocalyptic number.

12540243 is a deficient number, since it is larger than the sum of its proper divisors (4180085).

12540243 is an equidigital number, since it uses as much as digits as its factorization.

12540243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180084.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 12540243 is about 3541.2205522955. The cubic root of 12540243 is about 232.3282301641.

Adding to 12540243 its reverse (34204521), we get a palindrome (46744764).

The spelling of 12540243 in words is "twelve million, five hundred forty thousand, two hundred forty-three".