209868216 has 32 divisors (see below), whose sum is σ = 526122240. Its totient is φ = 69762528.

The previous prime is 209868209. The next prime is 209868227. The reversal of 209868216 is 612868902.

It is a congruent number.

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, 3106 + ... + 20721.

It is an arithmetic number, because the mean of its divisors is an integer number (16441320).

Almost surely, 2^209868216 is an apocalyptic number.

It is an amenable number.

209868216 is an abundant number, since it is smaller than the sum of its proper divisors (316254024).

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

209868216 is a wasteful number, since it uses less digits than its factorization.

209868216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24203 (or 24199 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 209868216 is about 14486.8290526257. The cubic root of 209868216 is about 594.2678337331.

The spelling of 209868216 in words is "two hundred nine million, eight hundred sixty-eight thousand, two hundred sixteen".