209957330 has 16 divisors (see below), whose sum is σ = 412280064. Its totient is φ = 76348080.

The previous prime is 209957329. The next prime is 209957359. The reversal of 209957330 is 33759902.

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 7 ways as a sum of consecutive naturals, for example, 954242 + ... + 954461.

It is an arithmetic number, because the mean of its divisors is an integer number (25767504).

Almost surely, 2^209957330 is an apocalyptic number.

209957330 is a deficient number, since it is larger than the sum of its proper divisors (202322734).

209957330 is a wasteful number, since it uses less digits than its factorization.

209957330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908721.

The product of its (nonzero) digits is 51030, while the sum is 38.

The square root of 209957330 is about 14489.9044165239. The cubic root of 209957330 is about 594.3519342716.

The spelling of 209957330 in words is "two hundred nine million, nine hundred fifty-seven thousand, three hundred thirty".