391622823616 has 56 divisors (see below), whose sum is σ = 783478402560. Its totient is φ = 194216047872.

The previous prime is 391622823589. The next prime is 391622823617. The reversal of 391622823616 is 616328226193.

It is a self number, because there is not a number n which added to its sum of digits gives 391622823616.

It is not an unprimeable number, because it can be changed into a prime (391622823617) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4908975 + ... + 4988113.

It is an arithmetic number, because the mean of its divisors is an integer number (13990685760).

Almost surely, 2^391622823616 is an apocalyptic number.

It is an amenable number.

391622823616 is an abundant number, since it is smaller than the sum of its proper divisors (391855578944).

391622823616 is a wasteful number, since it uses less digits than its factorization.

391622823616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79781 (or 79771 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The spelling of 391622823616 in words is "three hundred ninety-one billion, six hundred twenty-two million, eight hundred twenty-three thousand, six hundred sixteen".