209868213 has 16 divisors (see below), whose sum is σ = 296606016. Its totient is φ = 131539200.

The previous prime is 209868209. The next prime is 209868227. The reversal of 209868213 is 312868902.

It is a happy number.

It is not a de Polignac number, because 209868213 - 2² = 209868209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209868283) 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 15 ways as a sum of consecutive naturals, for example, 64770 + ... + 67932.

It is an arithmetic number, because the mean of its divisors is an integer number (18537876).

Almost surely, 2^209868213 is an apocalyptic number.

It is an amenable number.

209868213 is a deficient number, since it is larger than the sum of its proper divisors (86737803).

209868213 is a wasteful number, since it uses less digits than its factorization.

209868213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 209868213 is about 14486.8289490834. The cubic root of 209868213 is about 594.2678309015.

The spelling of 209868213 in words is "two hundred nine million, eight hundred sixty-eight thousand, two hundred thirteen".