394971367680 has 864 divisors, whose sum is σ = 1524731120640. Its totient is φ = 93939056640.

The previous prime is 394971367627. The next prime is 394971367717. The reversal of 394971367680 is 86763179493.

394971367680 is a `hidden beast` number, since 3 + 9 + 497 + 1 + 3 + 67 + 6 + 80 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 337293495 + ... + 337294665.

Almost surely, 2^394971367680 is an apocalyptic number.

394971367680 is a gapful number since it is divisible by the number (30) 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 394971367680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762365560320).

394971367680 is an abundant number, since it is smaller than the sum of its proper divisors (1129759752960).

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

394971367680 is a wasteful number, since it uses less digits than its factorization.

394971367680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 63.

The spelling of 394971367680 in words is "three hundred ninety-four billion, nine hundred seventy-one million, three hundred sixty-seven thousand, six hundred eighty".