819218 has 4 divisors (see below), whose sum is σ = 1228830. Its totient is φ = 409608.

The previous prime is 819187. The next prime is 819229. The reversal of 819218 is 812918.

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., 413449 + 405769 = 643^2 + 637^2 .

It is a super-2 number, since 2×819218² = 1342236263048, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 819218.

It is an unprimeable number.

819218 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204803 + ... + 204806.

2⁸¹⁹²¹⁸ is an apocalyptic number.

819218 is a deficient number, since it is larger than the sum of its proper divisors (409612).

819218 is a wasteful number, since it uses less digits than its factorization.

819218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409611.

The product of its digits is 1152, while the sum is 29.

The square root of 819218 is about 905.1066235533. The cubic root of 819218 is about 93.5692529344.

It can be divided in two parts, 8192 and 18, that multiplied together give a square (147456 = 384²).

The spelling of 819218 in words is "eight hundred nineteen thousand, two hundred eighteen".