394984857984 has 512 divisors, whose sum is σ = 1175228006400. Its totient is φ = 117050572800.

The previous prime is 394984857983. The next prime is 394984857989. The reversal of 394984857984 is 489758489493.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394984857983) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1405639924 + ... + 1405640204.

It is an arithmetic number, because the mean of its divisors is an integer number (2295367200).

Almost surely, 2^394984857984 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 394984857984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (587614003200).

394984857984 is an abundant number, since it is smaller than the sum of its proper divisors (780243148416).

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

394984857984 is a wasteful number, since it uses less digits than its factorization.

394984857984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 510 counting only the distinct ones).

The product of its digits is 2508226560, while the sum is 78.

The spelling of 394984857984 in words is "three hundred ninety-four billion, nine hundred eighty-four million, eight hundred fifty-seven thousand, nine hundred eighty-four".