209804 has 24 divisors (see below), whose sum is σ = 430080. Its totient is φ = 87696.

The previous prime is 209801. The next prime is 209809. The reversal of 209804 is 408902.

209804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 16.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 209804.

It is not an unprimeable number, because it can be changed into a prime (209801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (17920).

2²⁰⁹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

209804 is an abundant number, since it is smaller than the sum of its proper divisors (220276).

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

209804 is a wasteful number, since it uses less digits than its factorization.

209804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 209804 is about 458.0436660407. The cubic root of 209804 is about 59.4207215699.

The spelling of 209804 in words is "two hundred nine thousand, eight hundred four".