820219 has 4 divisors (see below), whose sum is σ = 826344. Its totient is φ = 814096.

The previous prime is 820213. The next prime is 820223. The reversal of 820219 is 912028.

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 820219 - 2⁵ = 820187 is a prime.

It is a super-2 number, since 2×820219² = 1345518415922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 820219.

It is not an unprimeable number, because it can be changed into a prime (820213) 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, 2857 + ... + 3130.

It is an arithmetic number, because the mean of its divisors is an integer number (206586).

2⁸²⁰²¹⁹ is an apocalyptic number.

820219 is a deficient number, since it is larger than the sum of its proper divisors (6125).

820219 is a wasteful number, since it uses less digits than its factorization.

820219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 820219 is about 905.6594282621. The cubic root of 820219 is about 93.6073480851.

Subtracting 820219 from its reverse (912028), we obtain a square (91809 = 303²).

The spelling of 820219 in words is "eight hundred twenty thousand, two hundred nineteen".