393831366866 has 24 divisors (see below), whose sum is σ = 687418974000. Its totient is φ = 168729995112.

The previous prime is 393831366823. The next prime is 393831366911. The reversal of 393831366866 is 668663138393.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 393831366799 and 393831366808.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 349616 + ... + 953883.

It is an arithmetic number, because the mean of its divisors is an integer number (28642457250).

Almost surely, 2^393831366866 is an apocalyptic number.

393831366866 is a deficient number, since it is larger than the sum of its proper divisors (293587607134).

393831366866 is a wasteful number, since it uses less digits than its factorization.

393831366866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306598 (or 1306591 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 62.

The spelling of 393831366866 in words is "three hundred ninety-three billion, eight hundred thirty-one million, three hundred sixty-six thousand, eight hundred sixty-six".