816444 has 18 divisors (see below), whose sum is σ = 2063880. Its totient is φ = 272136.

The previous prime is 816443. The next prime is 816451. The reversal of 816444 is 444618.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816443) 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 5 ways as a sum of consecutive naturals, for example, 11304 + ... + 11375.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2⁸¹⁶⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

816444 is an abundant number, since it is smaller than the sum of its proper divisors (1247436).

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

816444 is a wasteful number, since it uses less digits than its factorization.

816444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22689 (or 22684 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 816444 is about 903.5729079604. The cubic root of 816444 is about 93.4635201374.

The spelling of 816444 in words is "eight hundred sixteen thousand, four hundred forty-four".