1798117173938 has 6 divisors (see below), whose sum is σ = 2697178605471. Its totient is φ = 899057638782.

The previous prime is 1798117173901. The next prime is 1798117173947. The reversal of 1798117173938 is 8393717118971.

It can be written as a sum of positive squares in only one way, i.e., 899058586969 + 899058586969 = 948187^2 + 948187^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=948187.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1422281 + ... + 2370467.

Almost surely, 2^{1798117173938} is an apocalyptic number.

1798117173938 is a deficient number, since it is larger than the sum of its proper divisors (899061431533).

1798117173938 is an frugal number, since it uses more digits than its factorization.

1798117173938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896376 (or 948189 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 65.

The spelling of 1798117173938 in words is "one trillion, seven hundred ninety-eight billion, one hundred seventeen million, one hundred seventy-three thousand, nine hundred thirty-eight".