12438640912 has 20 divisors (see below), whose sum is σ = 24333849280. Its totient is φ = 6158937888.

The previous prime is 12438640901. The next prime is 12438640931. The reversal of 12438640912 is 21904683421.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3772212 + ... + 3775507.

It is an arithmetic number, because the mean of its divisors is an integer number (1216692464).

Almost surely, 2^12438640912 is an apocalyptic number.

It is an amenable number.

12438640912 is a deficient number, since it is larger than the sum of its proper divisors (11895208368).

12438640912 is a wasteful number, since it uses less digits than its factorization.

12438640912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7547830 (or 7547824 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 12438640912 in words is "twelve billion, four hundred thirty-eight million, six hundred forty thousand, nine hundred twelve".