217899852 has 48 divisors (see below), whose sum is σ = 533433600. Its totient is φ = 69133120.

The previous prime is 217899841. The next prime is 217899853. The reversal of 217899852 is 258998712.

It is a junction number, because it is equal to n+sod(n) for n = 217899795 and 217899804.

It is not an unprimeable number, because it can be changed into a prime (217899853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20299 + ... + 29117.

It is an arithmetic number, because the mean of its divisors is an integer number (11113200).

Almost surely, 2^217899852 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 217899852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266716800).

217899852 is an abundant number, since it is smaller than the sum of its proper divisors (315533748).

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

217899852 is a wasteful number, since it uses less digits than its factorization.

217899852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8926 (or 8924 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 217899852 is about 14761.4312314220. The cubic root of 217899852 is about 601.7539897590.

The spelling of 217899852 in words is "two hundred seventeen million, eight hundred ninety-nine thousand, eight hundred fifty-two".