12400531312 has 80 divisors (see below), whose sum is σ = 27017958240. Its totient is φ = 5474036736.

The previous prime is 12400531271. The next prime is 12400531327. The reversal of 12400531312 is 21313500421.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635818 + ... + 655030.

It is an arithmetic number, because the mean of its divisors is an integer number (337724478).

Almost surely, 2^12400531312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12400531312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13508979120).

12400531312 is an abundant number, since it is smaller than the sum of its proper divisors (14617426928).

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

12400531312 is a wasteful number, since it uses less digits than its factorization.

12400531312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19370 (or 19364 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The spelling of 12400531312 in words is "twelve billion, four hundred million, five hundred thirty-one thousand, three hundred twelve".