209853 has 12 divisors (see below), whose sum is σ = 346528. Its totient is φ = 119880.

The previous prime is 209851. The next prime is 209857. The reversal of 209853 is 358902.

It is not a de Polignac number, because 209853 - 2¹ = 209851 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1603 + ... + 1728.

2²⁰⁹⁸⁵³ is an apocalyptic number.

It is an amenable number.

209853 is a deficient number, since it is larger than the sum of its proper divisors (136675).

209853 is a wasteful number, since it uses less digits than its factorization.

209853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344 (or 3341 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 209853 is about 458.0971512682. The cubic root of 209853 is about 59.4253471390.

The spelling of 209853 in words is "two hundred nine thousand, eight hundred fifty-three".