209732988 has 48 divisors (see below), whose sum is σ = 517063680. Its totient is φ = 66058944.

The previous prime is 209732987. The next prime is 209732993. The reversal of 209732988 is 889237902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209732987) 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 15 ways as a sum of consecutive naturals, for example, 9945 + ... + 22767.

It is an arithmetic number, because the mean of its divisors is an integer number (10772160).

Almost surely, 2^209732988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209732988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258531840).

209732988 is an abundant number, since it is smaller than the sum of its proper divisors (307330692).

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

209732988 is a wasteful number, since it uses less digits than its factorization.

209732988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906 (or 12904 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 209732988 is about 14482.1610265872. The cubic root of 209732988 is about 594.1401680348.

The spelling of 209732988 in words is "two hundred nine million, seven hundred thirty-two thousand, nine hundred eighty-eight".