209315868 has 48 divisors (see below), whose sum is σ = 499474080. Its totient is φ = 68200704.

The previous prime is 209315867. The next prime is 209315903. The reversal of 209315868 is 868513902.

209315868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209315867) 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, 252078 + ... + 252906.

It is an arithmetic number, because the mean of its divisors is an integer number (10405710).

Almost surely, 2^209315868 is an apocalyptic number.

It is an amenable number.

209315868 is an abundant number, since it is smaller than the sum of its proper divisors (290158212).

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

209315868 is a wasteful number, since it uses less digits than its factorization.

209315868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 209315868 is about 14467.7526934904. The cubic root of 209315868 is about 593.7460284425.

The spelling of 209315868 in words is "two hundred nine million, three hundred fifteen thousand, eight hundred sixty-eight".