394899356160 has 640 divisors, whose sum is σ = 1482253344000. Its totient is φ = 99378855936.

The previous prime is 394899356153. The next prime is 394899356161. The reversal of 394899356160 is 61653998493.

394899356160 is a `hidden beast` number, since 3 + 9 + 4 + 8 + 9 + 9 + 3 + 5 + 616 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is not an unprimeable number, because it can be changed into a prime (394899356161) 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, 510865534 + ... + 510866306.

It is an arithmetic number, because the mean of its divisors is an integer number (2316020850).

Almost surely, 2^394899356160 is an apocalyptic number.

394899356160 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 394899356160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741126672000).

394899356160 is an abundant number, since it is smaller than the sum of its proper divisors (1087353987840).

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

394899356160 is a wasteful number, since it uses less digits than its factorization.

394899356160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1191 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 63.

The spelling of 394899356160 in words is "three hundred ninety-four billion, eight hundred ninety-nine million, three hundred fifty-six thousand, one hundred sixty".