816844 has 12 divisors (see below), whose sum is σ = 1633744. Its totient is φ = 350064.

The previous prime is 816841. The next prime is 816847. The reversal of 816844 is 448618.

It is an interprime number because it is at equal distance from previous prime (816841) and next prime (816847).

816844 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (816841) 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 3 ways as a sum of consecutive naturals, for example, 14559 + ... + 14614.

2⁸¹⁶⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

816844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816844 is a wasteful number, since it uses less digits than its factorization.

816844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29184 (or 29182 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 816844 is about 903.7942243675. The cubic root of 816844 is about 93.4787811573.

The spelling of 816844 in words is "eight hundred sixteen thousand, eight hundred forty-four".