217238146 has 8 divisors (see below), whose sum is σ = 326498940. Its totient is φ = 108405168.

The previous prime is 217238143. The next prime is 217238171. The reversal of 217238146 is 641832712.

217238146 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 217238121 + 25 = 14739^2 + 5^2 .

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

It is not an unprimeable number, because it can be changed into a prime (217238143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105681 + ... + 107716.

Almost surely, 2^217238146 is an apocalyptic number.

217238146 is a deficient number, since it is larger than the sum of its proper divisors (109260794).

217238146 is a wasteful number, since it uses less digits than its factorization.

217238146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213908.

The product of its digits is 16128, while the sum is 34.

The square root of 217238146 is about 14739.0008480901. Note that the first 3 decimals coincide. The cubic root of 217238146 is about 601.1442479221.

The spelling of 217238146 in words is "two hundred seventeen million, two hundred thirty-eight thousand, one hundred forty-six".