8205818 has 4 divisors (see below), whose sum is σ = 12308730. Its totient is φ = 4102908.

The previous prime is 8205817. The next prime is 8205829. The reversal of 8205818 is 8185028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7327849 + 877969 = 2707^2 + 937^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8205817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2051453 + ... + 2051456.

Almost surely, 2^8205818 is an apocalyptic number.

8205818 is a deficient number, since it is larger than the sum of its proper divisors (4102912).

8205818 is a wasteful number, since it uses less digits than its factorization.

8205818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102911.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 8205818 is about 2864.5798993919. The cubic root of 8205818 is about 201.7006479935.

The spelling of 8205818 in words is "eight million, two hundred five thousand, eight hundred eighteen".