209568385 has 16 divisors (see below), whose sum is σ = 285082560. Its totient is φ = 146612160.

The previous prime is 209568361. The next prime is 209568391. The reversal of 209568385 is 583865902.

It is not a de Polignac number, because 209568385 - 2¹¹ = 209566337 is a prime.

It is an unprimeable number.

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, 83611 + ... + 86080.

It is an arithmetic number, because the mean of its divisors is an integer number (17817660).

Almost surely, 2^209568385 is an apocalyptic number.

It is an amenable number.

209568385 is a deficient number, since it is larger than the sum of its proper divisors (75514175).

209568385 is a wasteful number, since it uses less digits than its factorization.

209568385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169728.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 209568385 is about 14476.4769540106. The cubic root of 209568385 is about 593.9846959897.

The spelling of 209568385 in words is "two hundred nine million, five hundred sixty-eight thousand, three hundred eighty-five".