397845 has 32 divisors (see below), whose sum is σ = 810240. Its totient is φ = 181440.

The previous prime is 397829. The next prime is 397849. The reversal of 397845 is 548793.

It is not a de Polignac number, because 397845 - 2⁴ = 397829 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 735 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (25320).

2³⁹⁷⁸⁴⁵ is an apocalyptic number.

397845 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

397845 is an abundant number, since it is smaller than the sum of its proper divisors (412395).

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

397845 is a wasteful number, since it uses less digits than its factorization.

397845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 436 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 397845 is about 630.7495541021. The cubic root of 397845 is about 73.5480735064.

The spelling of 397845 in words is "three hundred ninety-seven thousand, eight hundred forty-five".