209969868 has 54 divisors (see below), whose sum is σ = 506263156. Its totient is φ = 67731136.

The previous prime is 209969867. The next prime is 209969891. The reversal of 209969868 is 868969902.

It is not an unprimeable number, because it can be changed into a prime (209969863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2359168 + ... + 2359256.

Almost surely, 2^209969868 is an apocalyptic number.

It is an amenable number.

209969868 is an abundant number, since it is smaller than the sum of its proper divisors (296293288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209969868 is an equidigital number, since it uses as much as digits as its factorization.

209969868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The square root of 209969868 is about 14490.3370561212. The cubic root of 209969868 is about 594.3637649869.

The spelling of 209969868 in words is "two hundred nine million, nine hundred sixty-nine thousand, eight hundred sixty-eight".