397997064 has 96 divisors (see below), whose sum is σ = 1183684320. Its totient is φ = 124851456.

The previous prime is 397997063. The next prime is 397997069. The reversal of 397997064 is 460799793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 397997064.

It is not an unprimeable number, because it can be changed into a prime (397997063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27027 + ... + 39069.

It is an arithmetic number, because the mean of its divisors is an integer number (12330045).

Almost surely, 2^397997064 is an apocalyptic number.

397997064 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397997064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (591842160).

397997064 is an abundant number, since it is smaller than the sum of its proper divisors (785687256).

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

397997064 is a wasteful number, since it uses less digits than its factorization.

397997064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12081 (or 12065 counting only the distinct ones).

The product of its (nonzero) digits is 2571912, while the sum is 54.

The square root of 397997064 is about 19949.8637589333. The cubic root of 397997064 is about 735.5744280820.

The spelling of 397997064 in words is "three hundred ninety-seven million, nine hundred ninety-seven thousand, sixty-four".