209868233 has 16 divisors (see below), whose sum is σ = 220426752. Its totient is φ = 199584000.

The previous prime is 209868229. The next prime is 209868257. The reversal of 209868233 is 332868902.

It is a cyclic number.

It is not a de Polignac number, because 209868233 - 2² = 209868229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209868283) 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, 633878 + ... + 634208.

It is an arithmetic number, because the mean of its divisors is an integer number (13776672).

Almost surely, 2^209868233 is an apocalyptic number.

It is an amenable number.

209868233 is a deficient number, since it is larger than the sum of its proper divisors (10558519).

209868233 is a wasteful number, since it uses less digits than its factorization.

209868233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 209868233 is about 14486.8296393655. The cubic root of 209868233 is about 594.2678497790.

The spelling of 209868233 in words is "two hundred nine million, eight hundred sixty-eight thousand, two hundred thirty-three".