408505 has 4 divisors (see below), whose sum is σ = 490212. Its totient is φ = 326800.

The previous prime is 408497. The next prime is 408533. The reversal of 408505 is 505804.

It is a happy number.

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 76729 + 331776 = 277^2 + 576^2 .

It is not a de Polignac number, because 408505 - 2³ = 408497 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

408505 is a lucky 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, 40846 + ... + 40855.

It is an arithmetic number, because the mean of its divisors is an integer number (122553).

2⁴⁰⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

408505 is a deficient number, since it is larger than the sum of its proper divisors (81707).

408505 is an equidigital number, since it uses as much as digits as its factorization.

408505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81706.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 408505 is about 639.1439587448. The cubic root of 408505 is about 74.1991833739.

The spelling of 408505 in words is "four hundred eight thousand, five hundred five".