208990845 has 24 divisors (see below), whose sum is σ = 414001536. Its totient is φ = 95538528.

The previous prime is 208990841. The next prime is 208990853. The reversal of 208990845 is 548099802.

It is not a de Polignac number, because 208990845 - 2² = 208990841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 208990845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208990841) 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 23 ways as a sum of consecutive naturals, for example, 331417 + ... + 332046.

It is an arithmetic number, because the mean of its divisors is an integer number (17250064).

Almost surely, 2^208990845 is an apocalyptic number.

It is an amenable number.

208990845 is a deficient number, since it is larger than the sum of its proper divisors (205010691).

208990845 is a wasteful number, since it uses less digits than its factorization.

208990845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663481 (or 663478 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 208990845 is about 14456.5156590376. The cubic root of 208990845 is about 593.4385488270.

The spelling of 208990845 in words is "two hundred eight million, nine hundred ninety thousand, eight hundred forty-five".