12440023 has 4 divisors (see below), whose sum is σ = 12453568. Its totient is φ = 12426480.

The previous prime is 12440017. The next prime is 12440027. The reversal of 12440023 is 32004421.

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 12440023 - 2¹⁷ = 12308951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12439979 and 12440006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440027) 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, 5286 + ... + 7267.

It is an arithmetic number, because the mean of its divisors is an integer number (3113392).

Almost surely, 2^12440023 is an apocalyptic number.

12440023 is a deficient number, since it is larger than the sum of its proper divisors (13545).

12440023 is an equidigital number, since it uses as much as digits as its factorization.

12440023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13544.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12440023 is about 3527.0416782340. The cubic root of 12440023 is about 231.7076616605.

Adding to 12440023 its reverse (32004421), we get a palindrome (44444444).

The spelling of 12440023 in words is "twelve million, four hundred forty thousand, twenty-three".