809219 has 4 divisors (see below), whose sum is σ = 814800. Its totient is φ = 803640.

The previous prime is 809213. The next prime is 809231. The reversal of 809219 is 912908.

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

It is a cyclic number.

It is not a de Polignac number, because 809219 - 2⁴ = 809203 is a prime.

It is a super-2 number, since 2×809219² = 1309670779922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809191 and 809200.

It is not an unprimeable number, because it can be changed into a prime (809213) 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, 2567 + ... + 2864.

It is an arithmetic number, because the mean of its divisors is an integer number (203700).

2⁸⁰⁹²¹⁹ is an apocalyptic number.

809219 is a deficient number, since it is larger than the sum of its proper divisors (5581).

809219 is a wasteful number, since it uses less digits than its factorization.

809219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 809219 is about 899.5660064720. The cubic root of 809219 is about 93.1870056853.

The spelling of 809219 in words is "eight hundred nine thousand, two hundred nineteen".