209898912 has 48 divisors (see below), whose sum is σ = 552660192. Its totient is φ = 69753600.

The previous prime is 209898911. The next prime is 209898929. The reversal of 209898912 is 219898902.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (209898911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30162 + ... + 36462.

It is an arithmetic number, because the mean of its divisors is an integer number (11513754).

Almost surely, 2^209898912 is an apocalyptic number.

It is an amenable number.

209898912 is an abundant number, since it is smaller than the sum of its proper divisors (342761280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209898912 is a wasteful number, since it uses less digits than its factorization.

209898912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6661 (or 6653 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 209898912 is about 14487.8884589853. Note that the first 3 decimals coincide. The cubic root of 209898912 is about 594.2968054953.

The spelling of 209898912 in words is "two hundred nine million, eight hundred ninety-eight thousand, nine hundred twelve".