200809 has 4 divisors (see below), whose sum is σ = 229504. Its totient is φ = 172116.

The previous prime is 200807. The next prime is 200843. The reversal of 200809 is 908002.

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 not a de Polignac number, because 200809 - 2¹ = 200807 is a prime.

It is a magnanimous number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14337 + ... + 14350.

It is an arithmetic number, because the mean of its divisors is an integer number (57376).

2²⁰⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

200809 is a deficient number, since it is larger than the sum of its proper divisors (28695).

200809 is an equidigital number, since it uses as much as digits as its factorization.

200809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28694.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 200809 is about 448.1171721771. The cubic root of 200809 is about 58.5590996968.

The spelling of 200809 in words is "two hundred thousand, eight hundred nine".