209345668 has 24 divisors (see below), whose sum is σ = 420046592. Its totient is φ = 89429184.

The previous prime is 209345663. The next prime is 209345723. The reversal of 209345668 is 866543902.

It is not an unprimeable number, because it can be changed into a prime (209345663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3180 + ... + 20707.

Almost surely, 2^209345668 is an apocalyptic number.

209345668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209345668 is an abundant number, since it is smaller than the sum of its proper divisors (210700924).

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

209345668 is a wasteful number, since it uses less digits than its factorization.

209345668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24211 (or 24209 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 209345668 is about 14468.7825334407. The cubic root of 209345668 is about 593.7742040290.

The spelling of 209345668 in words is "two hundred nine million, three hundred forty-five thousand, six hundred sixty-eight".