8213805 has 40 divisors (see below), whose sum is σ = 15603192. Its totient is φ = 4119552.

The previous prime is 8213797. The next prime is 8213813. The reversal of 8213805 is 5083128.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8213797) and next prime (8213813).

It can be written as a sum of positive squares in 4 ways, for example, as 1726596 + 6487209 = 1314^2 + 2547^2 .

It is not a de Polignac number, because 8213805 - 2³ = 8213797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6289 + ... + 7481.

Almost surely, 2^8213805 is an apocalyptic number.

8213805 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8213805 is a deficient number, since it is larger than the sum of its proper divisors (7389387).

8213805 is a wasteful number, since it uses less digits than its factorization.

8213805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 8213805 is about 2865.9736565433. The cubic root of 8213805 is about 201.7660674590.

The spelling of 8213805 in words is "eight million, two hundred thirteen thousand, eight hundred five".