209049966 has 24 divisors (see below), whose sum is σ = 457178904. Its totient is φ = 69031440.

The previous prime is 209049941. The next prime is 209049977. The reversal of 209049966 is 669940902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52345 + ... + 56196.

It is an arithmetic number, because the mean of its divisors is an integer number (19049121).

Almost surely, 2^209049966 is an apocalyptic number.

209049966 is an abundant number, since it is smaller than the sum of its proper divisors (248128938).

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

209049966 is a wasteful number, since it uses less digits than its factorization.

209049966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108656 (or 108653 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 209049966 is about 14458.5603017728. The cubic root of 209049966 is about 593.4945024304.

The spelling of 209049966 in words is "two hundred nine million, forty-nine thousand, nine hundred sixty-six".