209839265228 has 12 divisors (see below), whose sum is σ = 379881428640. Its totient is φ = 101301714192.

The previous prime is 209839265221. The next prime is 209839265261. The reversal of 209839265228 is 822562938902.

It is a happy number.

209839265228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (209839265221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 904479476 + ... + 904479707.

It is an arithmetic number, because the mean of its divisors is an integer number (31656785720).

Almost surely, 2^209839265228 is an apocalyptic number.

It is an amenable number.

209839265228 is a deficient number, since it is larger than the sum of its proper divisors (170042163412).

209839265228 is a wasteful number, since it uses less digits than its factorization.

209839265228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808959216 (or 1808959214 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 209839265228 in words is "two hundred nine billion, eight hundred thirty-nine million, two hundred sixty-five thousand, two hundred twenty-eight".