816219 has 12 divisors (see below), whose sum is σ = 1193400. Its totient is φ = 537504.

The previous prime is 816217. The next prime is 816223. The reversal of 816219 is 912618.

It is not a de Polignac number, because 816219 - 2¹ = 816217 is a prime.

It is a super-2 number, since 2×816219² = 1332426911922, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 816192 and 816201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292 + ... + 1310.

It is an arithmetic number, because the mean of its divisors is an integer number (99450).

2⁸¹⁶²¹⁹ is an apocalyptic number.

816219 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

816219 is a deficient number, since it is larger than the sum of its proper divisors (377181).

816219 is a wasteful number, since it uses less digits than its factorization.

816219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1111 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 816219 is about 903.4483936562. The cubic root of 816219 is about 93.4549336232.

It can be divided in two parts, 816 and 219, that added together give a triangular number (1035 = T₄₅).

The spelling of 816219 in words is "eight hundred sixteen thousand, two hundred nineteen".