12400031844 has 18 divisors (see below), whose sum is σ = 31344525030. Its totient is φ = 4133343936.

The previous prime is 12400031827. The next prime is 12400031849. The reversal of 12400031844 is 44813000421.

It can be written as a sum of positive squares in only one way, i.e., 7488825444 + 4911206400 = 86538^2 + 70080^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (12400031849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 172222629 + ... + 172222700.

Almost surely, 2^12400031844 is an apocalyptic number.

It is an amenable number.

12400031844 is an abundant number, since it is smaller than the sum of its proper divisors (18944493186).

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

12400031844 is a wasteful number, since it uses less digits than its factorization.

12400031844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344445339 (or 344445334 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The spelling of 12400031844 in words is "twelve billion, four hundred million, thirty-one thousand, eight hundred forty-four".