209830 has 8 divisors (see below), whose sum is σ = 377712. Its totient is φ = 83928.

The previous prime is 209821. The next prime is 209837. The reversal of 209830 is 38902.

209830 is nontrivially palindromic in base 12.

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

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10482 + ... + 10501.

It is an arithmetic number, because the mean of its divisors is an integer number (47214).

2²⁰⁹⁸³⁰ is an apocalyptic number.

209830 is a deficient number, since it is larger than the sum of its proper divisors (167882).

209830 is a wasteful number, since it uses less digits than its factorization.

209830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20990.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 209830 is about 458.0720467350. The cubic root of 209830 is about 59.4231760432.

The spelling of 209830 in words is "two hundred nine thousand, eight hundred thirty".