12138887823436 has 48 divisors (see below), whose sum is σ = 24605780935680. Its totient is φ = 5178641496320.

The previous prime is 12138887823427. The next prime is 12138887823481. The reversal of 12138887823436 is 63432878883121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22333780 + ... + 22870843.

It is an arithmetic number, because the mean of its divisors is an integer number (512620436160).

Almost surely, 2^{12138887823436} is an apocalyptic number.

It is an amenable number.

12138887823436 is an abundant number, since it is smaller than the sum of its proper divisors (12466893112244).

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

12138887823436 is a wasteful number, since it uses less digits than its factorization.

12138887823436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45205014 (or 45205012 counting only the distinct ones).

The product of its digits is 74317824, while the sum is 64.

The spelling of 12138887823436 in words is "twelve trillion, one hundred thirty-eight billion, eight hundred eighty-seven million, eight hundred twenty-three thousand, four hundred thirty-six".