12138843937 has 32 divisors (see below), whose sum is σ = 14135425920. Its totient is φ = 10308280320.

The previous prime is 12138843919. The next prime is 12138843967. The reversal of 12138843937 is 73934883121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12138843937 is a prime.

It is a Smith number, since the sum of its digits (49) 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 (12138843907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6344493 + ... + 6346405.

It is an arithmetic number, because the mean of its divisors is an integer number (441732060).

Almost surely, 2^12138843937 is an apocalyptic number.

It is an amenable number.

12138843937 is a deficient number, since it is larger than the sum of its proper divisors (1996581983).

12138843937 is a wasteful number, since it uses less digits than its factorization.

12138843937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its digits is 870912, while the sum is 49.

The spelling of 12138843937 in words is "twelve billion, one hundred thirty-eight million, eight hundred forty-three thousand, nine hundred thirty-seven".