209340816 has 40 divisors (see below), whose sum is σ = 546884640. Its totient is φ = 68994816.

The previous prime is 209340809. The next prime is 209340829. The reversal of 209340816 is 618043902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20230 + ... + 28773.

It is an arithmetic number, because the mean of its divisors is an integer number (13672116).

Almost surely, 2^209340816 is an apocalyptic number.

It is an amenable number.

209340816 is an abundant number, since it is smaller than the sum of its proper divisors (337543824).

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

209340816 is a wasteful number, since it uses less digits than its factorization.

209340816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49103 (or 49097 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 209340816 is about 14468.6148611400. The cubic root of 209340816 is about 593.7696166963.

The spelling of 209340816 in words is "two hundred nine million, three hundred forty thousand, eight hundred sixteen".