397818768 has 80 divisors (see below), whose sum is σ = 1091448000. Its totient is φ = 124428288.

The previous prime is 397818761. The next prime is 397818809. The reversal of 397818768 is 867818793.

It is not an unprimeable number, because it can be changed into a prime (397818761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406696 + ... + 407672.

It is an arithmetic number, because the mean of its divisors is an integer number (13643100).

Almost surely, 2^397818768 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 397818768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545724000).

397818768 is an abundant number, since it is smaller than the sum of its proper divisors (693629232).

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

397818768 is a wasteful number, since it uses less digits than its factorization.

397818768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1498 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 57.

The square root of 397818768 is about 19945.3946564113. The cubic root of 397818768 is about 735.4645700125.

The spelling of 397818768 in words is "three hundred ninety-seven million, eight hundred eighteen thousand, seven hundred sixty-eight".