394681711844 has 192 divisors, whose sum is σ = 906402201600. Its totient is φ = 146446185600.

The previous prime is 394681711807. The next prime is 394681711883. The reversal of 394681711844 is 448117186493.

It is a super-2 number, since 2×394681711844² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394681711844.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29959379 + ... + 29972549.

It is an arithmetic number, because the mean of its divisors is an integer number (4720844800).

Almost surely, 2^394681711844 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 394681711844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453201100800).

394681711844 is an abundant number, since it is smaller than the sum of its proper divisors (511720489756).

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

394681711844 is a wasteful number, since it uses less digits than its factorization.

394681711844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13334 (or 13332 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The spelling of 394681711844 in words is "three hundred ninety-four billion, six hundred eighty-one million, seven hundred eleven thousand, eight hundred forty-four".