12638909409 has 8 divisors (see below), whose sum is σ = 19259290560. Its totient is φ = 7222233936.

The previous prime is 12638909407. The next prime is 12638909419. The reversal of 12638909409 is 90490983621.

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

It is not a de Polignac number, because 12638909409 - 2¹ = 12638909407 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12638909407) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 300926394 + ... + 300926435.

It is an arithmetic number, because the mean of its divisors is an integer number (2407411320).

Almost surely, 2^12638909409 is an apocalyptic number.

It is an amenable number.

12638909409 is a deficient number, since it is larger than the sum of its proper divisors (6620381151).

12638909409 is an equidigital number, since it uses as much as digits as its factorization.

12638909409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601852839.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 12638909409 in words is "twelve billion, six hundred thirty-eight million, nine hundred nine thousand, four hundred nine".