411805 has 4 divisors (see below), whose sum is σ = 494172. Its totient is φ = 329440.

The previous prime is 411799. The next prime is 411809. The reversal of 411805 is 508114.

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 191844 + 219961 = 438^2 + 469^2 .

It is a de Polignac number, because none of the positive numbers 2^k-411805 is a prime.

It is a Duffinian number.

411805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (411809) 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, 41176 + ... + 41185.

It is an arithmetic number, because the mean of its divisors is an integer number (123543).

2⁴¹¹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

411805 is a deficient number, since it is larger than the sum of its proper divisors (82367).

411805 is an equidigital number, since it uses as much as digits as its factorization.

411805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82366.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 411805 is about 641.7203440752. The cubic root of 411805 is about 74.3984472833.

Adding to 411805 its reverse (508114), we get a palindrome (919919).

The spelling of 411805 in words is "four hundred eleven thousand, eight hundred five".