397318320 has 240 divisors, whose sum is σ = 1574756352. Its totient is φ = 87851520.

The previous prime is 397318309. The next prime is 397318333. The reversal of 397318320 is 23813793.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154969 + ... + 157511.

Almost surely, 2^397318320 is an apocalyptic number.

397318320 is a gapful number since it is divisible by the number (30) 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 397318320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787378176).

397318320 is an abundant number, since it is smaller than the sum of its proper divisors (1177438032).

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

397318320 is a wasteful number, since it uses less digits than its factorization.

397318320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600 (or 2591 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 397318320 is about 19932.8452560090. The cubic root of 397318320 is about 735.1560407283.

The spelling of 397318320 in words is "three hundred ninety-seven million, three hundred eighteen thousand, three hundred twenty".