12440004423 has 32 divisors (see below), whose sum is σ = 20705298432. Its totient is φ = 6454274400.

The previous prime is 12440004413. The next prime is 12440004427. The reversal of 12440004423 is 32440004421.

It is a happy number.

It is not a de Polignac number, because 12440004423 - 2⁵ = 12440004391 is a prime.

It is a super-4 number, since 4×12440004423⁴ (a number of 41 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12440004393 and 12440004402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440004427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154140 + ... + 220542.

It is an arithmetic number, because the mean of its divisors is an integer number (647040576).

Almost surely, 2^12440004423 is an apocalyptic number.

12440004423 is a deficient number, since it is larger than the sum of its proper divisors (8265294009).

12440004423 is a wasteful number, since it uses less digits than its factorization.

12440004423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67235.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 12440004423 its reverse (32440004421), we get a palindrome (44880008844).

The spelling of 12440004423 in words is "twelve billion, four hundred forty million, four thousand, four hundred twenty-three".