217042 has 16 divisors (see below), whose sum is σ = 383040. Its totient is φ = 90288.

The previous prime is 217033. The next prime is 217057. The reversal of 217042 is 240712.

It is an unprimeable number.

217042 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2²¹⁷⁰⁴² is an apocalyptic number.

217042 is a deficient number, since it is larger than the sum of its proper divisors (165998).

217042 is a wasteful number, since it uses less digits than its factorization.

217042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 217042 is about 465.8776663460. The cubic root of 217042 is about 60.0963267513.

Adding to 217042 its reverse (240712), we get a palindrome (457754).

The spelling of 217042 in words is "two hundred seventeen thousand, forty-two", and thus it is an iban number.