209669229 has 40 divisors (see below), whose sum is σ = 390506688. Its totient is φ = 108915840.

The previous prime is 209669227. The next prime is 209669249. The reversal of 209669229 is 922966902.

It is not a de Polignac number, because 209669229 - 2¹ = 209669227 is a prime.

It is a super-2 number, since 2×209669229² = 87922371178908882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209669221) 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 39 ways as a sum of consecutive naturals, for example, 10572 + ... + 23045.

Almost surely, 2^209669229 is an apocalyptic number.

It is an amenable number.

209669229 is a deficient number, since it is larger than the sum of its proper divisors (180837459).

209669229 is a wasteful number, since it uses less digits than its factorization.

209669229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33647 (or 33638 counting only the distinct ones).

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

The square root of 209669229 is about 14479.9595648607. The cubic root of 209669229 is about 594.0799555670.

The spelling of 209669229 in words is "two hundred nine million, six hundred sixty-nine thousand, two hundred twenty-nine".