217800234 has 24 divisors (see below), whose sum is σ = 487124352. Its totient is φ = 70257960.

The previous prime is 217800223. The next prime is 217800251. The reversal of 217800234 is 432008712.

It is a junction number, because it is equal to n+sod(n) for n = 217800198 and 217800207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194604 + ... + 195719.

It is an arithmetic number, because the mean of its divisors is an integer number (20296848).

Almost surely, 2^217800234 is an apocalyptic number.

217800234 is an abundant number, since it is smaller than the sum of its proper divisors (269324118).

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

217800234 is a wasteful number, since it uses less digits than its factorization.

217800234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390362 (or 390359 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 217800234 is about 14758.0565793739. The cubic root of 217800234 is about 601.6622738233.

Adding to 217800234 its reverse (432008712), we get a palindrome (649808946).

The spelling of 217800234 in words is "two hundred seventeen million, eight hundred thousand, two hundred thirty-four".