8213305 has 4 divisors (see below), whose sum is σ = 9855972. Its totient is φ = 6570640.

The previous prime is 8213291. The next prime is 8213311. The reversal of 8213305 is 5033128.

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 5400976 + 2812329 = 2324^2 + 1677^2 .

It is not a de Polignac number, because 8213305 - 2⁵ = 8213273 is a prime.

It is a Duffinian 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, 821326 + ... + 821335.

It is an arithmetic number, because the mean of its divisors is an integer number (2463993).

Almost surely, 2^8213305 is an apocalyptic number.

It is an amenable number.

8213305 is a deficient number, since it is larger than the sum of its proper divisors (1642667).

8213305 is a wasteful number, since it uses less digits than its factorization.

8213305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642666.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 8213305 is about 2865.8864248257. The cubic root of 8213305 is about 201.7619733321.

The spelling of 8213305 in words is "eight million, two hundred thirteen thousand, three hundred five".