397987581600 has 576 divisors, whose sum is σ = 1647044582400. Its totient is φ = 90856442880.

The previous prime is 397987581577. The next prime is 397987581613. The reversal of 397987581600 is 6185789793.

397987581600 is a `hidden beast` number, since 397 + 9 + 87 + 5 + 8 + 160 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 238743967 + ... + 238745633.

It is an arithmetic number, because the mean of its divisors is an integer number (2859452400).

Almost surely, 2^397987581600 is an apocalyptic number.

397987581600 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 397987581600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823522291200).

397987581600 is an abundant number, since it is smaller than the sum of its proper divisors (1249057000800).

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

397987581600 is a wasteful number, since it uses less digits than its factorization.

397987581600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282 (or 3263 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 397987581600 in words is "three hundred ninety-seven billion, nine hundred eighty-seven million, five hundred eighty-one thousand, six hundred".