394540966512 has 480 divisors, whose sum is σ = 1423698591744. Its totient is φ = 98986406400.

The previous prime is 394540966451. The next prime is 394540966549. The reversal of 394540966512 is 215669045493.

394540966512 is a `hidden beast` number, since 3 + 9 + 4 + 540 + 96 + 6 + 5 + 1 + 2 = 666.

It is a super-2 number, since 2×394540966512² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 332384383 + ... + 332385569.

Almost surely, 2^394540966512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394540966512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711849295872).

394540966512 is an abundant number, since it is smaller than the sum of its proper divisors (1029157625232).

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

394540966512 is a wasteful number, since it uses less digits than its factorization.

394540966512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 394540966512 in words is "three hundred ninety-four billion, five hundred forty million, nine hundred sixty-six thousand, five hundred twelve".