12638401926 has 16 divisors (see below), whose sum is σ = 25444201728. Its totient is φ = 4184901000.

The previous prime is 12638401921. The next prime is 12638401939. The reversal of 12638401926 is 62910483621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638401921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6973930 + ... + 6975741.

It is an arithmetic number, because the mean of its divisors is an integer number (1590262608).

Almost surely, 2^12638401926 is an apocalyptic number.

12638401926 is an abundant number, since it is smaller than the sum of its proper divisors (12805799802).

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

12638401926 is a wasteful number, since it uses less digits than its factorization.

12638401926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13949827.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 12638401926 in words is "twelve billion, six hundred thirty-eight million, four hundred one thousand, nine hundred twenty-six".