217072 has 10 divisors (see below), whose sum is σ = 420608. Its totient is φ = 108528.

The previous prime is 217069. The next prime is 217081. The reversal of 217072 is 270712.

It is an Ulam number.

It is a congruent number.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 6768 + ... + 6799.

2²¹⁷⁰⁷² is an apocalyptic number.

It is an amenable number.

217072 is a deficient number, since it is larger than the sum of its proper divisors (203536).

217072 is a wasteful number, since it uses less digits than its factorization.

217072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13575 (or 13569 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 217072 is about 465.9098625271. The cubic root of 217072 is about 60.0990955038.

Adding to 217072 its reverse (270712), we get a palindrome (487784).

The spelling of 217072 in words is "two hundred seventeen thousand, seventy-two", and thus it is an iban number.