208321985 has 8 divisors (see below), whose sum is σ = 263143680. Its totient is φ = 157886064.

The previous prime is 208321937. The next prime is 208321991. The reversal of 208321985 is 589123802.

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

It is a cyclic number.

It is not a de Polignac number, because 208321985 - 2⁶ = 208321921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1096337 + ... + 1096526.

It is an arithmetic number, because the mean of its divisors is an integer number (32892960).

Almost surely, 2^208321985 is an apocalyptic number.

It is an amenable number.

208321985 is a deficient number, since it is larger than the sum of its proper divisors (54821695).

208321985 is a wasteful number, since it uses less digits than its factorization.

208321985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2192887.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 208321985 is about 14433.3636065887. The cubic root of 208321985 is about 592.8047866033.

The spelling of 208321985 in words is "two hundred eight million, three hundred twenty-one thousand, nine hundred eighty-five".