12440543 has 4 divisors (see below), whose sum is σ = 12447600. Its totient is φ = 12433488.

The previous prime is 12440537. The next prime is 12440551. The reversal of 12440543 is 34504421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34504421 = 7 ⋅4929203.

It is a cyclic number.

It is not a de Polignac number, because 12440543 - 2⁶ = 12440479 is a prime.

It is a super-2 number, since 2×12440543² = 309534220269698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440513) 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, 1646 + ... + 5252.

It is an arithmetic number, because the mean of its divisors is an integer number (3111900).

Almost surely, 2^12440543 is an apocalyptic number.

12440543 is a deficient number, since it is larger than the sum of its proper divisors (7057).

12440543 is an equidigital number, since it uses as much as digits as its factorization.

12440543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 12440543 is about 3527.1153936326. The cubic root of 12440543 is about 231.7108901193.

Adding to 12440543 its reverse (34504421), we get a palindrome (46944964).

The spelling of 12440543 in words is "twelve million, four hundred forty thousand, five hundred forty-three".