12440436403 has 4 divisors (see below), whose sum is σ = 12440935368. Its totient is φ = 12439937440.

The previous prime is 12440436383. The next prime is 12440436413. The reversal of 12440436403 is 30463404421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440436403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440436413) 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, 210001 + ... + 262642.

It is an arithmetic number, because the mean of its divisors is an integer number (3110233842).

Almost surely, 2^12440436403 is an apocalyptic number.

12440436403 is a deficient number, since it is larger than the sum of its proper divisors (498965).

12440436403 is an equidigital number, since it uses as much as digits as its factorization.

12440436403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498964.

The product of its (nonzero) digits is 27648, while the sum is 31.

The spelling of 12440436403 in words is "twelve billion, four hundred forty million, four hundred thirty-six thousand, four hundred three".