394639397712 has 240 divisors, whose sum is σ = 1303927971840. Its totient is φ = 109033862400.

The previous prime is 394639397707. The next prime is 394639397773. The reversal of 394639397712 is 217793936493.

394639397712 is a `hidden beast` number, since 3 + 9 + 463 + 93 + 9 + 77 + 12 = 666.

It is a super-2 number, since 2×394639397712² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

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

It is a self number, because there is not a number n which added to its sum of digits gives 394639397712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49086589 + ... + 49094627.

It is an arithmetic number, because the mean of its divisors is an integer number (5433033216).

Almost surely, 2^394639397712 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 394639397712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (651963985920).

394639397712 is an abundant number, since it is smaller than the sum of its proper divisors (909288574128).

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

394639397712 is a wasteful number, since it uses less digits than its factorization.

394639397712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662 (or 9653 counting only the distinct ones).

The product of its digits is 46294416, while the sum is 63.

The spelling of 394639397712 in words is "three hundred ninety-four billion, six hundred thirty-nine million, three hundred ninety-seven thousand, seven hundred twelve".