208643 has 4 divisors (see below), whose sum is σ = 214320. Its totient is φ = 202968.

The previous prime is 208631. The next prime is 208657. The reversal of 208643 is 346802.

It is a happy number.

208643 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.

It is a cyclic number.

It is not a de Polignac number, because 208643 - 2⁴ = 208627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208673) 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, 2783 + ... + 2856.

It is an arithmetic number, because the mean of its divisors is an integer number (53580).

2²⁰⁸⁶⁴³ is an apocalyptic number.

208643 is a deficient number, since it is larger than the sum of its proper divisors (5677).

208643 is an equidigital number, since it uses as much as digits as its factorization.

208643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 208643 is about 456.7745614633. The cubic root of 208643 is about 59.3109125685.

It can be divided in two parts, 2086 and 43, that multiplied together give a palindrome (89698).

The spelling of 208643 in words is "two hundred eight thousand, six hundred forty-three".