12438640886 has 48 divisors (see below), whose sum is σ = 23013418032. Its totient is φ = 5010163200.

The previous prime is 12438640847. The next prime is 12438640891. The reversal of 12438640886 is 68804683421.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1262921 + ... + 1272731.

It is an arithmetic number, because the mean of its divisors is an integer number (479446209).

Almost surely, 2^12438640886 is an apocalyptic number.

12438640886 is a deficient number, since it is larger than the sum of its proper divisors (10574777146).

12438640886 is a wasteful number, since it uses less digits than its factorization.

12438640886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605 (or 10598 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 12438640886 in words is "twelve billion, four hundred thirty-eight million, six hundred forty thousand, eight hundred eighty-six".