809218 has 8 divisors (see below), whose sum is σ = 1218060. Its totient is φ = 403200.

The previous prime is 809213. The next prime is 809231. The reversal of 809218 is 812908.

It can be written as a sum of positive squares in 2 ways, for example, as 762129 + 47089 = 873^2 + 217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (809213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298 + ... + 1306.

2⁸⁰⁹²¹⁸ is an apocalyptic number.

809218 is a deficient number, since it is larger than the sum of its proper divisors (408842).

809218 is a wasteful number, since it uses less digits than its factorization.

809218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 809218 is about 899.5654506483. The cubic root of 809218 is about 93.1869672997.

The spelling of 809218 in words is "eight hundred nine thousand, two hundred eighteen".