12400203444 has 24 divisors (see below), whose sum is σ = 30635797248. Its totient is φ = 3890259840.

The previous prime is 12400203433. The next prime is 12400203493. The reversal of 12400203444 is 44430200421.

It is a happy number.

It is a super-2 number, since 2×12400203444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30392452 + ... + 30392859.

It is an arithmetic number, because the mean of its divisors is an integer number (1276491552).

Almost surely, 2^12400203444 is an apocalyptic number.

It is an amenable number.

12400203444 is an abundant number, since it is smaller than the sum of its proper divisors (18235593804).

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

12400203444 is a wasteful number, since it uses less digits than its factorization.

12400203444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60785335 (or 60785333 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 12400203444 its reverse (44430200421), we get a palindrome (56830403865).

The spelling of 12400203444 in words is "twelve billion, four hundred million, two hundred three thousand, four hundred forty-four".