217415242 has 8 divisors (see below), whose sum is σ = 355770432. Its totient is φ = 98825100.

The previous prime is 217415239. The next prime is 217415249. The reversal of 217415242 is 242514712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 217415242.

It is not an unprimeable number, because it can be changed into a prime (217415249) 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 3 ways as a sum of consecutive naturals, for example, 4941234 + ... + 4941277.

It is an arithmetic number, because the mean of its divisors is an integer number (44471304).

Almost surely, 2^217415242 is an apocalyptic number.

217415242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

217415242 is a deficient number, since it is larger than the sum of its proper divisors (138355190).

217415242 is a wasteful number, since it uses less digits than its factorization.

217415242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882524.

The product of its digits is 4480, while the sum is 28.

The square root of 217415242 is about 14745.0073584247. The cubic root of 217415242 is about 601.3075576775.

Adding to 217415242 its reverse (242514712), we get a palindrome (459929954).

The spelling of 217415242 in words is "two hundred seventeen million, four hundred fifteen thousand, two hundred forty-two".