208689 has 8 divisors (see below), whose sum is σ = 299712. Its totient is φ = 128400.

The previous prime is 208687. The next prime is 208697. The reversal of 208689 is 986802.

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

It is not a de Polignac number, because 208689 - 2¹ = 208687 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208687) 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, 2637 + ... + 2714.

It is an arithmetic number, because the mean of its divisors is an integer number (37464).

2²⁰⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

208689 is a deficient number, since it is larger than the sum of its proper divisors (91023).

208689 is a wasteful number, since it uses less digits than its factorization.

208689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 208689 is about 456.8249117550. The cubic root of 208689 is about 59.3152710524.

The spelling of 208689 in words is "two hundred eight thousand, six hundred eighty-nine".