397800640 has 56 divisors (see below), whose sum is σ = 988466400. Its totient is φ = 152199168.

The previous prime is 397800631. The next prime is 397800643. The reversal of 397800640 is 46008793.

397800640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 397800640.

It is not an unprimeable number, because it can be changed into a prime (397800643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19665 + ... + 34384.

Almost surely, 2^397800640 is an apocalyptic number.

It is an amenable number.

397800640 is an abundant number, since it is smaller than the sum of its proper divisors (590665760).

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

397800640 is a wasteful number, since it uses less digits than its factorization.

397800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54089 (or 54079 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 397800640 is about 19944.9402104895. The cubic root of 397800640 is about 735.4533985065.

The spelling of 397800640 in words is "three hundred ninety-seven million, eight hundred thousand, six hundred forty".