397818 has 32 divisors (see below), whose sum is σ = 907200. Its totient is φ = 129168.

The previous prime is 397811. The next prime is 397829. The reversal of 397818 is 818793.

It is a super-2 number, since 2×397818² = 316518322248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397811) 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, 2793 + ... + 2931.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2³⁹⁷⁸¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453600).

397818 is an abundant number, since it is smaller than the sum of its proper divisors (509382).

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

397818 is a wasteful number, since it uses less digits than its factorization.

397818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 197 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 397818 is about 630.7281506323. The cubic root of 397818 is about 73.5464096734.

The spelling of 397818 in words is "three hundred ninety-seven thousand, eight hundred eighteen".