397388664 has 96 divisors (see below), whose sum is σ = 1128085920. Its totient is φ = 126137088.

The previous prime is 397388627. The next prime is 397388669. The reversal of 397388664 is 466883793.

It is a self number, because there is not a number n which added to its sum of digits gives 397388664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397388669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 524574 + ... + 525330.

It is an arithmetic number, because the mean of its divisors is an integer number (11750895).

Almost surely, 2^397388664 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 397388664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (564042960).

397388664 is an abundant number, since it is smaller than the sum of its proper divisors (730697256).

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

397388664 is a wasteful number, since it uses less digits than its factorization.

397388664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1102 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 397388664 is about 19934.6097027256. The cubic root of 397388664 is about 735.1994238817.

The spelling of 397388664 in words is "three hundred ninety-seven million, three hundred eighty-eight thousand, six hundred sixty-four".