217240506 has 24 divisors (see below), whose sum is σ = 537929184. Its totient is φ = 62068680.

The previous prime is 217240487. The next prime is 217240511. The reversal of 217240506 is 605042712.

It is a self number, because there is not a number n which added to its sum of digits gives 217240506.

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, 861940 + ... + 862191.

It is an arithmetic number, because the mean of its divisors is an integer number (22413716).

Almost surely, 2^217240506 is an apocalyptic number.

217240506 is an abundant number, since it is smaller than the sum of its proper divisors (320688678).

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

217240506 is a wasteful number, since it uses less digits than its factorization.

217240506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724146 (or 1724143 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 217240506 is about 14739.0809075736. The cubic root of 217240506 is about 601.1464247885.

The spelling of 217240506 in words is "two hundred seventeen million, two hundred forty thousand, five hundred six".