408805 has 4 divisors (see below), whose sum is σ = 490572. Its totient is φ = 327040.

The previous prime is 408803. The next prime is 408809. The reversal of 408805 is 508804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160801 + 248004 = 401^2 + 498^2 .

It is not a de Polignac number, because 408805 - 2¹ = 408803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408803) 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 3 ways as a sum of consecutive naturals, for example, 40876 + ... + 40885.

It is an arithmetic number, because the mean of its divisors is an integer number (122643).

2⁴⁰⁸⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

408805 is a deficient number, since it is larger than the sum of its proper divisors (81767).

408805 is an equidigital number, since it uses as much as digits as its factorization.

408805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81766.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 408805 is about 639.3786045842. The cubic root of 408805 is about 74.2173425218.

Subtracting 408805 from its reverse (508804), we obtain a palindrome (99999).

The spelling of 408805 in words is "four hundred eight thousand, eight hundred five".