397826 has 24 divisors (see below), whose sum is σ = 711504. Its totient is φ = 165360.

The previous prime is 397811. The next prime is 397829. The reversal of 397826 is 628793.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397826.

It is not an unprimeable number, because it can be changed into a prime (397829) by changing a digit.

397826 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3665 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (29646).

2³⁹⁷⁸²⁶ is an apocalyptic number.

397826 is a deficient number, since it is larger than the sum of its proper divisors (313678).

397826 is a wasteful number, since it uses less digits than its factorization.

397826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 133 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 397826 is about 630.7344924768. The cubic root of 397826 is about 73.5469026688.

It can be divided in two parts, 3978 and 26, that added together give a palindrome (4004).

The spelling of 397826 in words is "three hundred ninety-seven thousand, eight hundred twenty-six".