12138662438 has 8 divisors (see below), whose sum is σ = 20809135632. Its totient is φ = 5202283896.

The previous prime is 12138662429. The next prime is 12138662441. The reversal of 12138662438 is 83426683121.

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

It is a congruent number.

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, 433523645 + ... + 433523672.

It is an arithmetic number, because the mean of its divisors is an integer number (2601141954).

Almost surely, 2^12138662438 is an apocalyptic number.

12138662438 is a deficient number, since it is larger than the sum of its proper divisors (8670473194).

12138662438 is an equidigital number, since it uses as much as digits as its factorization.

12138662438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867047326.

The product of its digits is 331776, while the sum is 44.

The spelling of 12138662438 in words is "twelve billion, one hundred thirty-eight million, six hundred sixty-two thousand, four hundred thirty-eight".