209223217 has 16 divisors (see below), whose sum is σ = 243331200. Its totient is φ = 176198400.

The previous prime is 209223191. The next prime is 209223221. The reversal of 209223217 is 712322902.

It is a de Polignac number, because none of the positive numbers 2^k-209223217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209223017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97209 + ... + 99337.

It is an arithmetic number, because the mean of its divisors is an integer number (15208200).

Almost surely, 2^209223217 is an apocalyptic number.

It is an amenable number.

209223217 is a deficient number, since it is larger than the sum of its proper divisors (34107983).

209223217 is a wasteful number, since it uses less digits than its factorization.

209223217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 209223217 is about 14464.5503559565. The cubic root of 209223217 is about 593.6584108107.

The spelling of 209223217 in words is "two hundred nine million, two hundred twenty-three thousand, two hundred seventeen".