12440400412 has 24 divisors (see below), whose sum is σ = 24075202032. Its totient is φ = 5577264000.

The previous prime is 12440400377. The next prime is 12440400419. The reversal of 12440400412 is 21400404421.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440400419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1933339 + ... + 1939762.

It is an arithmetic number, because the mean of its divisors is an integer number (1003133418).

Almost surely, 2^12440400412 is an apocalyptic number.

It is an amenable number.

12440400412 is a deficient number, since it is larger than the sum of its proper divisors (11634801620).

12440400412 is a wasteful number, since it uses less digits than its factorization.

12440400412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873189 (or 3873187 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 12440400412 its reverse (21400404421), we get a palindrome (33840804833).

The spelling of 12440400412 in words is "twelve billion, four hundred forty million, four hundred thousand, four hundred twelve".