391946397696 has 960 divisors, whose sum is σ = 1409901292800. Its totient is φ = 106125852672.

The previous prime is 391946397659. The next prime is 391946397709. The reversal of 391946397696 is 696793649193.

391946397696 is a `hidden beast` number, since 3 + 9 + 1 + 9 + 463 + 9 + 76 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3468552136 + ... + 3468552248.

It is an arithmetic number, because the mean of its divisors is an integer number (1468647180).

Almost surely, 2^391946397696 is an apocalyptic number.

391946397696 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391946397696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704950646400).

391946397696 is an abundant number, since it is smaller than the sum of its proper divisors (1017954895104).

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

391946397696 is a wasteful number, since it uses less digits than its factorization.

391946397696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 257 counting only the distinct ones).

The product of its digits is 357128352, while the sum is 72.

The spelling of 391946397696 in words is "three hundred ninety-one billion, nine hundred forty-six million, three hundred ninety-seven thousand, six hundred ninety-six".