209297316 has 12 divisors (see below), whose sum is σ = 488360432. Its totient is φ = 69765768.

The previous prime is 209297311. The next prime is 209297323. The reversal of 209297316 is 613792902.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (209297311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8720710 + ... + 8720733.

Almost surely, 2^209297316 is an apocalyptic number.

It is an amenable number.

209297316 is an abundant number, since it is smaller than the sum of its proper divisors (279063116).

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

209297316 is a wasteful number, since it uses less digits than its factorization.

209297316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17441450 (or 17441448 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 209297316 is about 14467.1115292584. Note that the first 3 decimals coincide. The cubic root of 209297316 is about 593.7284863710.

The spelling of 209297316 in words is "two hundred nine million, two hundred ninety-seven thousand, three hundred sixteen".