397806 has 8 divisors (see below), whose sum is σ = 795624. Its totient is φ = 132600.

The previous prime is 397799. The next prime is 397807. The reversal of 397806 is 608793.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

397806 is an admirable number.

It is a super-2 number, since 2×397806² = 316499227272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397807) by changing a digit.

397806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33145 + ... + 33156.

It is an arithmetic number, because the mean of its divisors is an integer number (99453).

2³⁹⁷⁸⁰⁶ is an apocalyptic number.

397806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

397806 is a wasteful number, since it uses less digits than its factorization.

397806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66306.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 397806 is about 630.7186377459. The cubic root of 397806 is about 73.5456701679.

The spelling of 397806 in words is "three hundred ninety-seven thousand, eight hundred six".