12440342403423 has 16 divisors (see below), whose sum is σ = 20105603884800. Its totient is φ = 7539601456440.

The previous prime is 12440342403373. The next prime is 12440342403427. The reversal of 12440342403423 is 32430424304421.

12440342403423 is a `hidden beast` number, since 1 + 2 + 4 + 40 + 34 + 240 + 342 + 3 = 666.

It is not a de Polignac number, because 12440342403423 - 2²² = 12440338209119 is a prime.

It is a super-2 number, since 2×12440342403423² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440342403427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20943337083 + ... + 20943337676.

It is an arithmetic number, because the mean of its divisors is an integer number (1256600242800).

Almost surely, 2^{12440342403423} is an apocalyptic number.

12440342403423 is a deficient number, since it is larger than the sum of its proper divisors (7665261481377).

12440342403423 is a wasteful number, since it uses less digits than its factorization.

12440342403423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41886674779 (or 41886674773 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 36.

Adding to 12440342403423 its reverse (32430424304421), we get a palindrome (44870766707844).

The spelling of 12440342403423 in words is "twelve trillion, four hundred forty billion, three hundred forty-two million, four hundred three thousand, four hundred twenty-three".