12400965891 has 16 divisors (see below), whose sum is σ = 18495108000. Its totient is φ = 8211822624.

The previous prime is 12400965887. The next prime is 12400965919. The reversal of 12400965891 is 19856900421.

12400965891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12400965891 - 2² = 12400965887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12400965851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1537236 + ... + 1545281.

It is an arithmetic number, because the mean of its divisors is an integer number (1155944250).

Almost surely, 2^12400965891 is an apocalyptic number.

12400965891 is a deficient number, since it is larger than the sum of its proper divisors (6094142109).

12400965891 is a wasteful number, since it uses less digits than its factorization.

12400965891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082675 (or 3082669 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 12400965891 in words is "twelve billion, four hundred million, nine hundred sixty-five thousand, eight hundred ninety-one".