217380252 has 24 divisors (see below), whose sum is σ = 507788176. Its totient is φ = 72379008.

The previous prime is 217380239. The next prime is 217380257. The reversal of 217380252 is 252083712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217380257) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1578 + ... + 20910.

Almost surely, 2^217380252 is an apocalyptic number.

It is an amenable number.

217380252 is an abundant number, since it is smaller than the sum of its proper divisors (290407924).

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

217380252 is a wasteful number, since it uses less digits than its factorization.

217380252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20277 (or 20275 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 217380252 is about 14743.8208073755. The cubic root of 217380252 is about 601.2752985467.

The spelling of 217380252 in words is "two hundred seventeen million, three hundred eighty thousand, two hundred fifty-two".