873809 has 4 divisors (see below), whose sum is σ = 878400. Its totient is φ = 869220.

The previous prime is 873787. The next prime is 873863. The reversal of 873809 is 908378.

873809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 873809 - 2⁸ = 873553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 873809.

It is not an unprimeable number, because it can be changed into a prime (873109) 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, 1997 + ... + 2394.

It is an arithmetic number, because the mean of its divisors is an integer number (219600).

2⁸⁷³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

873809 is a deficient number, since it is larger than the sum of its proper divisors (4591).

873809 is a wasteful number, since it uses less digits than its factorization.

873809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 873809 is about 934.7775136363. Note that the first 3 decimals coincide. The cubic root of 873809 is about 95.6031432240.

The spelling of 873809 in words is "eight hundred seventy-three thousand, eight hundred nine".