209898638 has 16 divisors (see below), whose sum is σ = 317834064. Its totient is φ = 103958400.

The previous prime is 209898629. The next prime is 209898673. The reversal of 209898638 is 836898902.

It is a self number, because there is not a number n which added to its sum of digits gives 209898638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125081 + ... + 126747.

It is an arithmetic number, because the mean of its divisors is an integer number (19864629).

Almost surely, 2^209898638 is an apocalyptic number.

209898638 is a deficient number, since it is larger than the sum of its proper divisors (107935426).

209898638 is a wasteful number, since it uses less digits than its factorization.

209898638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 209898638 is about 14487.8790028078. The cubic root of 209898638 is about 594.2965468988.

The spelling of 209898638 in words is "two hundred nine million, eight hundred ninety-eight thousand, six hundred thirty-eight".