12438171842 has 8 divisors (see below), whose sum is σ = 18657834300. Its totient is φ = 6218893744.

The previous prime is 12438171793. The next prime is 12438171871. The reversal of 12438171842 is 24817183421.

It can be written as a sum of positive squares in 2 ways, for example, as 10477364881 + 1960806961 = 102359^2 + 44281^2 .

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

It is a super-2 number, since 2×12438171842² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12438171842.

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, 6884 + ... + 157872.

Almost surely, 2^12438171842 is an apocalyptic number.

12438171842 is a deficient number, since it is larger than the sum of its proper divisors (6219662458).

12438171842 is a wasteful number, since it uses less digits than its factorization.

12438171842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192180.

The product of its digits is 86016, while the sum is 41.

The spelling of 12438171842 in words is "twelve billion, four hundred thirty-eight million, one hundred seventy-one thousand, eight hundred forty-two".