209943293 has 12 divisors (see below), whose sum is σ = 257074560. Its totient is φ = 170479512.

The previous prime is 209943289. The next prime is 209943323. The reversal of 209943293 is 392349902.

It is not a de Polignac number, because 209943293 - 2² = 209943289 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 209943293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209943233) by changing a digit.

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, 111821 + ... + 113682.

It is an arithmetic number, because the mean of its divisors is an integer number (21422880).

Almost surely, 2^209943293 is an apocalyptic number.

It is an amenable number.

209943293 is a deficient number, since it is larger than the sum of its proper divisors (47131267).

209943293 is a wasteful number, since it uses less digits than its factorization.

209943293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225536 (or 225529 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 209943293 is about 14489.4200367026. The cubic root of 209943293 is about 594.3386885579.

The spelling of 209943293 in words is "two hundred nine million, nine hundred forty-three thousand, two hundred ninety-three".