397828 has 12 divisors (see below), whose sum is σ = 700672. Its totient is φ = 197640.

The previous prime is 397811. The next prime is 397829. The reversal of 397828 is 828793.

397828 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

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 3 ways as a sum of consecutive naturals, for example, 901 + ... + 1267.

2³⁹⁷⁸²⁸ is an apocalyptic number.

It is an amenable number.

397828 is a deficient number, since it is larger than the sum of its proper divisors (302844).

397828 is a wasteful number, since it uses less digits than its factorization.

397828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 640 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 397828 is about 630.7360779280. The cubic root of 397828 is about 73.5470259166.

It can be divided in two parts, 397 and 828, that added together give a triangular number (1225 = T₄₉).

The spelling of 397828 in words is "three hundred ninety-seven thousand, eight hundred twenty-eight".