397745 has 4 divisors (see below), whose sum is σ = 477300. Its totient is φ = 318192.

The previous prime is 397729. The next prime is 397751. The reversal of 397745 is 547793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547793 = 241 ⋅2273.

It can be written as a sum of positive squares in 2 ways, for example, as 312481 + 85264 = 559^2 + 292^2 .

It is a cyclic number.

It is not a de Polignac number, because 397745 - 2⁴ = 397729 is a prime.

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, 39770 + ... + 39779.

It is an arithmetic number, because the mean of its divisors is an integer number (119325).

2³⁹⁷⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

397745 is a deficient number, since it is larger than the sum of its proper divisors (79555).

397745 is an equidigital number, since it uses as much as digits as its factorization.

397745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79554.

The product of its digits is 26460, while the sum is 35.

The square root of 397745 is about 630.6702783547. The cubic root of 397745 is about 73.5419107850.

The spelling of 397745 in words is "three hundred ninety-seven thousand, seven hundred forty-five".