393821118394 has 16 divisors (see below), whose sum is σ = 650815101216. Its totient is φ = 177237226000.

The previous prime is 393821118373. The next prime is 393821118413. The reversal of 393821118394 is 493811128393.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88616392 + ... + 88620835.

It is an arithmetic number, because the mean of its divisors is an integer number (40675943826).

Almost surely, 2^393821118394 is an apocalyptic number.

393821118394 is a deficient number, since it is larger than the sum of its proper divisors (256993982822).

393821118394 is a wasteful number, since it uses less digits than its factorization.

393821118394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177237341.

The product of its digits is 1119744, while the sum is 52.

Subtracting 393821118394 from its reverse (493811128393), we obtain a palindrome (99990009999).

It can be divided in two parts, 393821 and 118394, that added together give a palindrome (512215).

The spelling of 393821118394 in words is "three hundred ninety-three billion, eight hundred twenty-one million, one hundred eighteen thousand, three hundred ninety-four".