818305 has 4 divisors (see below), whose sum is σ = 981972. Its totient is φ = 654640.

The previous prime is 818303. The next prime is 818309. The reversal of 818305 is 503818.

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 266256 + 552049 = 516^2 + 743^2 .

It is not a de Polignac number, because 818305 - 2¹ = 818303 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 818305.

It is not an unprimeable number, because it can be changed into a prime (818303) 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, 81826 + ... + 81835.

It is an arithmetic number, because the mean of its divisors is an integer number (245493).

2⁸¹⁸³⁰⁵ is an apocalyptic number.

It is an amenable number.

818305 is a deficient number, since it is larger than the sum of its proper divisors (163667).

818305 is a wasteful number, since it uses less digits than its factorization.

818305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163666.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 818305 is about 904.6021224826. The cubic root of 818305 is about 93.5344797387.

The spelling of 818305 in words is "eight hundred eighteen thousand, three hundred five".