816213 has 8 divisors (see below), whose sum is σ = 1103488. Its totient is φ = 536544.

The previous prime is 816209. The next prime is 816217. The reversal of 816213 is 312618.

816213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (816209) and next prime (816217).

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

It is not a de Polignac number, because 816213 - 2² = 816209 is a prime.

It is a super-2 number, since 2×816213² = 1332407322738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 816213.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (137936).

2⁸¹⁶²¹³ is an apocalyptic number.

It is an amenable number.

816213 is a deficient number, since it is larger than the sum of its proper divisors (287275).

816213 is a wasteful number, since it uses less digits than its factorization.

816213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803.

The product of its digits is 288, while the sum is 21.

The square root of 816213 is about 903.4450730399. The cubic root of 816213 is about 93.4547046279.

The spelling of 816213 in words is "eight hundred sixteen thousand, two hundred thirteen".