208555989 has 8 divisors (see below), whose sum is σ = 292710240. Its totient is φ = 131719536.

The previous prime is 208555981. The next prime is 208556057. The reversal of 208555989 is 989555802.

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

It is not a de Polignac number, because 208555989 - 2³ = 208555981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208555981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1829382 + ... + 1829495.

It is an arithmetic number, because the mean of its divisors is an integer number (36588780).

Almost surely, 2^208555989 is an apocalyptic number.

It is an amenable number.

208555989 is a deficient number, since it is larger than the sum of its proper divisors (84154251).

208555989 is a wasteful number, since it uses less digits than its factorization.

208555989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658899.

The product of its (nonzero) digits is 1296000, while the sum is 51.

The square root of 208555989 is about 14441.4676885696. The cubic root of 208555989 is about 593.0266655434.

The spelling of 208555989 in words is "two hundred eight million, five hundred fifty-five thousand, nine hundred eighty-nine".