397843 has 4 divisors (see below), whose sum is σ = 399168. Its totient is φ = 396520.

The previous prime is 397829. The next prime is 397849. The reversal of 397843 is 348793.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 348793 = 53 ⋅6581.

It is a cyclic number.

It is not a de Polignac number, because 397843 - 2⁵ = 397811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 397799 and 397808.

It is not an unprimeable number, because it can be changed into a prime (397849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (99792).

2³⁹⁷⁸⁴³ is an apocalyptic number.

397843 is a deficient number, since it is larger than the sum of its proper divisors (1325).

397843 is an equidigital number, since it uses as much as digits as its factorization.

397843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

The product of its digits is 18144, while the sum is 34.

The square root of 397843 is about 630.7479686848. The cubic root of 397843 is about 73.5479502621.

The spelling of 397843 in words is "three hundred ninety-seven thousand, eight hundred forty-three".