12440400023 has 4 divisors (see below), whose sum is σ = 12440657520. Its totient is φ = 12440142528.

The previous prime is 12440400001. The next prime is 12440400053. The reversal of 12440400023 is 32000404421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32000404421 = 577 ⋅55459973.

It is a cyclic number.

It is not a de Polignac number, because 12440400023 - 2⁸ = 12440399767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12440399968 and 12440400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440400053) 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, 32090 + ... + 160967.

It is an arithmetic number, because the mean of its divisors is an integer number (3110164380).

Almost surely, 2^12440400023 is an apocalyptic number.

12440400023 is a deficient number, since it is larger than the sum of its proper divisors (257497).

12440400023 is an equidigital number, since it uses as much as digits as its factorization.

12440400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257496.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 12440400023 its reverse (32000404421), we get a palindrome (44440804444).

The spelling of 12440400023 in words is "twelve billion, four hundred forty million, four hundred thousand, twenty-three".