12438171843 has 4 divisors (see below), whose sum is σ = 16584229128. Its totient is φ = 8292114560.

The previous prime is 12438171793. The next prime is 12438171871. The reversal of 12438171843 is 34817183421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12438171843 - 2¹³ = 12438163651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12438171795 and 12438171804.

It is not an unprimeable number, because it can be changed into a prime (12438173843) 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 3 ways as a sum of consecutive naturals, for example, 2073028638 + ... + 2073028643.

It is an arithmetic number, because the mean of its divisors is an integer number (4146057282).

Almost surely, 2^12438171843 is an apocalyptic number.

12438171843 is a deficient number, since it is larger than the sum of its proper divisors (4146057285).

12438171843 is an equidigital number, since it uses as much as digits as its factorization.

12438171843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4146057284.

The product of its digits is 129024, while the sum is 42.

The spelling of 12438171843 in words is "twelve billion, four hundred thirty-eight million, one hundred seventy-one thousand, eight hundred forty-three".