12638445338 has 8 divisors (see below), whose sum is σ = 18974858688. Its totient is φ = 6313492444.

The previous prime is 12638445317. The next prime is 12638445341. The reversal of 12638445338 is 83354483621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12638445338² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12638445292 and 12638445301.

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, 2862356 + ... + 2866767.

It is an arithmetic number, because the mean of its divisors is an integer number (2371857336).

Almost surely, 2^12638445338 is an apocalyptic number.

12638445338 is a deficient number, since it is larger than the sum of its proper divisors (6336413350).

12638445338 is a wasteful number, since it uses less digits than its factorization.

12638445338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730228.

The product of its digits is 1658880, while the sum is 47.

The spelling of 12638445338 in words is "twelve billion, six hundred thirty-eight million, four hundred forty-five thousand, three hundred thirty-eight".