12540431312 has 40 divisors (see below), whose sum is σ = 26038738176. Its totient is φ = 5835494016.

The previous prime is 12540431311. The next prime is 12540431329. The reversal of 12540431312 is 21313404521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12540431311) 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, 446888 + ... + 474119.

Almost surely, 2^12540431312 is an apocalyptic number.

It is an amenable number.

12540431312 is an abundant number, since it is smaller than the sum of its proper divisors (13498306864).

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

12540431312 is a wasteful number, since it uses less digits than its factorization.

12540431312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921075 (or 921069 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 12540431312 its reverse (21313404521), we get a palindrome (33853835833).

The spelling of 12540431312 in words is "twelve billion, five hundred forty million, four hundred thirty-one thousand, three hundred twelve".