916809 has 4 divisors (see below), whose sum is σ = 1222416. Its totient is φ = 611204.

The previous prime is 916787. The next prime is 916831. The reversal of 916809 is 908619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908619 = 3 ⋅302873.

It is an interprime number because it is at equal distance from previous prime (916787) and next prime (916831).

It is a cyclic number.

It is not a de Polignac number, because 916809 - 2¹³ = 908617 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 916809.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 916809.

It is not an unprimeable number, because it can be changed into a prime (916859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152799 + ... + 152804.

It is an arithmetic number, because the mean of its divisors is an integer number (305604).

2⁹¹⁶⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

916809 is a deficient number, since it is larger than the sum of its proper divisors (305607).

916809 is a wasteful number, since it uses less digits than its factorization.

916809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305606.

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

The square root of 916809 is about 957.5014360303. The cubic root of 916809 is about 97.1463055910.

The spelling of 916809 in words is "nine hundred sixteen thousand, eight hundred nine".