397791 has 12 divisors (see below), whose sum is σ = 596232. Its totient is φ = 265032.

The previous prime is 397763. The next prime is 397799. The reversal of 397791 is 197793.

It is not a de Polignac number, because 397791 - 2⁵ = 397759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (49686).

2³⁹⁷⁷⁹¹ is an apocalyptic number.

397791 is a deficient number, since it is larger than the sum of its proper divisors (198441).

397791 is an equidigital number, since it uses as much as digits as its factorization.

397791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1640 counting only the distinct ones).

The product of its digits is 11907, while the sum is 36.

The square root of 397791 is about 630.7067464361. The cubic root of 397791 is about 73.5447457651.

The spelling of 397791 in words is "three hundred ninety-seven thousand, seven hundred ninety-one".