397840768128 has 128 divisors (see below), whose sum is σ = 1190268273600. Its totient is φ = 130796881920.

The previous prime is 397840768093. The next prime is 397840768151. The reversal of 397840768128 is 821867048793.

397840768128 is a `hidden beast` number, since 39 + 78 + 407 + 6 + 8 + 128 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536178 + ... + 1040753.

Almost surely, 2^397840768128 is an apocalyptic number.

It is an amenable number.

397840768128 is an abundant number, since it is smaller than the sum of its proper divisors (792427505472).

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

397840768128 is a wasteful number, since it uses less digits than its factorization.

397840768128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577027 (or 1577009 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 397840768128 in words is "three hundred ninety-seven billion, eight hundred forty million, seven hundred sixty-eight thousand, one hundred twenty-eight".