12400052440 has 32 divisors (see below), whose sum is σ = 27957451680. Its totient is φ = 4949828352.

The previous prime is 12400052419. The next prime is 12400052443. The reversal of 12400052440 is 4425000421.

It is a happy number.

It is a super-2 number, since 2×12400052440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400052443) 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, 298797 + ... + 337756.

It is an arithmetic number, because the mean of its divisors is an integer number (873670365).

Almost surely, 2^12400052440 is an apocalyptic number.

12400052440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400052440 is an abundant number, since it is smaller than the sum of its proper divisors (15557399240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12400052440 is a wasteful number, since it uses less digits than its factorization.

12400052440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637051 (or 637047 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 12400052440 its reverse (4425000421), we get a palindrome (16825052861).

The spelling of 12400052440 in words is "twelve billion, four hundred million, fifty-two thousand, four hundred forty".