395809 has 4 divisors (see below), whose sum is σ = 397204. Its totient is φ = 394416.

The previous prime is 395803. The next prime is 395849. The reversal of 395809 is 908593.

395809 is nontrivially palindromic in base 8.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 305809 + 90000 = 553^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 395809 - 2¹¹ = 393761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (99301).

2³⁹⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

395809 is a deficient number, since it is larger than the sum of its proper divisors (1395).

395809 is an equidigital number, since it uses as much as digits as its factorization.

395809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 395809 is about 629.1335311363. The cubic root of 395809 is about 73.4223963809.

The spelling of 395809 in words is "three hundred ninety-five thousand, eight hundred nine".