397945 has 4 divisors (see below), whose sum is σ = 477540. Its totient is φ = 318352.

The previous prime is 397939. The next prime is 397951. The reversal of 397945 is 549793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549793 = 61 ⋅9013.

It is an interprime number because it is at equal distance from previous prime (397939) and next prime (397951).

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 283024 = 339^2 + 532^2 .

It is a cyclic number.

It is not a de Polignac number, because 397945 - 2⁹ = 397433 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39790 + ... + 39799.

It is an arithmetic number, because the mean of its divisors is an integer number (119385).

2³⁹⁷⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

397945 is a deficient number, since it is larger than the sum of its proper divisors (79595).

397945 is an equidigital number, since it uses as much as digits as its factorization.

397945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79594.

The product of its digits is 34020, while the sum is 37.

The square root of 397945 is about 630.8288198870. The cubic root of 397945 is about 73.5542351952.

The spelling of 397945 in words is "three hundred ninety-seven thousand, nine hundred forty-five".