209898 has 48 divisors (see below), whose sum is σ = 527040. Its totient is φ = 61776.

The previous prime is 209887. The next prime is 209917. The reversal of 209898 is 898902.

209898 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9115 + ... + 9137.

It is an arithmetic number, because the mean of its divisors is an integer number (10980).

2²⁰⁹⁸⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263520).

209898 is an abundant number, since it is smaller than the sum of its proper divisors (317142).

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

209898 is a wasteful number, since it uses less digits than its factorization.

209898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 209898 is about 458.1462648544. The cubic root of 209898 is about 59.4295944764.

Multiplying 209898 by its sum of digits (36), we get a triangular number (7556328 = T₃₈₈₇).

The spelling of 209898 in words is "two hundred nine thousand, eight hundred ninety-eight".