397856488960 has 640 divisors, whose sum is σ = 1212361261056. Its totient is φ = 122093568000.

The previous prime is 397856488957. The next prime is 397856488999. The reversal of 397856488960 is 69884658793.

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

It is a congruent number.

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, 529768585 + ... + 529769335.

Almost surely, 2^397856488960 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 397856488960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606180630528).

397856488960 is an abundant number, since it is smaller than the sum of its proper divisors (814504772096).

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

397856488960 is a wasteful number, since it uses less digits than its factorization.

397856488960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 627056640, while the sum is 73.

The spelling of 397856488960 in words is "three hundred ninety-seven billion, eight hundred fifty-six million, four hundred eighty-eight thousand, nine hundred sixty".