397888128 has 192 divisors, whose sum is σ = 1323241920. Its totient is φ = 113418240.

The previous prime is 397888103. The next prime is 397888151. The reversal of 397888128 is 821888793.

It is a tau number, because it is divible by the number of its divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214501 + ... + 216347.

It is an arithmetic number, because the mean of its divisors is an integer number (6891885).

Almost surely, 2^397888128 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 397888128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661620960).

397888128 is an abundant number, since it is smaller than the sum of its proper divisors (925353792).

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

397888128 is a wasteful number, since it uses less digits than its factorization.

397888128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895 (or 1880 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 397888128 is about 19947.1333278745. The cubic root of 397888128 is about 735.5073104614.

The spelling of 397888128 in words is "three hundred ninety-seven million, eight hundred eighty-eight thousand, one hundred twenty-eight".