12440403023 has 4 divisors (see below), whose sum is σ = 12467272608. Its totient is φ = 12413533440.

The previous prime is 12440403011. The next prime is 12440403029. The reversal of 12440403023 is 32030404421.

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 12440403023 - 2²⁴ = 12423625807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12440403023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440403029) 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, 13434098 + ... + 13435023.

It is an arithmetic number, because the mean of its divisors is an integer number (3116818152).

Almost surely, 2^12440403023 is an apocalyptic number.

12440403023 is a deficient number, since it is larger than the sum of its proper divisors (26869585).

12440403023 is an equidigital number, since it uses as much as digits as its factorization.

12440403023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26869584.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 12440403023 its reverse (32030404421), we get a palindrome (44470807444).

The spelling of 12440403023 in words is "twelve billion, four hundred forty million, four hundred three thousand, twenty-three".