393979156816 has 20 divisors (see below), whose sum is σ = 872382418912. Its totient is φ = 168848210016.

The previous prime is 393979156777. The next prime is 393979156897. The reversal of 393979156816 is 618651979393.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1758835410 + ... + 1758835633.

Almost surely, 2^393979156816 is an apocalyptic number.

It is an amenable number.

393979156816 is an abundant number, since it is smaller than the sum of its proper divisors (478403262096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393979156816 is a wasteful number, since it uses less digits than its factorization.

393979156816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517671058 (or 3517671052 counting only the distinct ones).

The product of its digits is 66134880, while the sum is 67.

The spelling of 393979156816 in words is "three hundred ninety-three billion, nine hundred seventy-nine million, one hundred fifty-six thousand, eight hundred sixteen".