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208289 = 316719
BaseRepresentation
bin110010110110100001
3101120201102
4302312201
523131124
64244145
71525154
oct626641
9346642
10208289
11132544
12a0655
1373a63
1455c9b
1541aae
hex32da1

208289 has 4 divisors (see below), whose sum is σ = 215040. Its totient is φ = 201540.

The previous prime is 208283. The next prime is 208291. The reversal of 208289 is 982802.

208289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-208289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208283) 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, 3329 + ... + 3390.

It is an arithmetic number, because the mean of its divisors is an integer number (53760).

2208289 is an apocalyptic number.

It is an amenable number.

208289 is a deficient number, since it is larger than the sum of its proper divisors (6751).

208289 is an equidigital number, since it uses as much as digits as its factorization.

208289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 208289 is about 456.3868972703. The cubic root of 208289 is about 59.2773497382.

The spelling of 208289 in words is "two hundred eight thousand, two hundred eighty-nine".

Divisors: 1 31 6719 208289