209798 has 8 divisors (see below), whose sum is σ = 331320. Its totient is φ = 99360.

The previous prime is 209789. The next prime is 209801. The reversal of 209798 is 897902.

209798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (41415).

2²⁰⁹⁷⁹⁸ is an apocalyptic number.

209798 is a deficient number, since it is larger than the sum of its proper divisors (121522).

209798 is a wasteful number, since it uses less digits than its factorization.

209798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5542.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 209798 is about 458.0371164000. The cubic root of 209798 is about 59.4201551242.

The spelling of 209798 in words is "two hundred nine thousand, seven hundred ninety-eight".