208303989 has 16 divisors (see below), whose sum is σ = 283489920. Its totient is φ = 136019520.

The previous prime is 208303987. The next prime is 208303993. The reversal of 208303989 is 989303802.

It is not a de Polignac number, because 208303989 - 2¹ = 208303987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 208303989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208303981) 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 15 ways as a sum of consecutive naturals, for example, 30327 + ... + 36555.

It is an arithmetic number, because the mean of its divisors is an integer number (17718120).

Almost surely, 2^208303989 is an apocalyptic number.

It is an amenable number.

208303989 is a deficient number, since it is larger than the sum of its proper divisors (75185931).

208303989 is a wasteful number, since it uses less digits than its factorization.

208303989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 208303989 is about 14432.7401764183. The cubic root of 208303989 is about 592.7877161980.

The spelling of 208303989 in words is "two hundred eight million, three hundred three thousand, nine hundred eighty-nine".