809916 has 12 divisors (see below), whose sum is σ = 1889832. Its totient is φ = 269968.

The previous prime is 809909. The next prime is 809917. The reversal of 809916 is 619908.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 809916.

It is not an unprimeable number, because it can be changed into a prime (809917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33735 + ... + 33758.

It is an arithmetic number, because the mean of its divisors is an integer number (157486).

2⁸⁰⁹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

809916 is an abundant number, since it is smaller than the sum of its proper divisors (1079916).

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

809916 is a wasteful number, since it uses less digits than its factorization.

809916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67500 (or 67498 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 809916 is about 899.9533321234. The cubic root of 809916 is about 93.2137527520.

The spelling of 809916 in words is "eight hundred nine thousand, nine hundred sixteen".