217912 has 8 divisors (see below), whose sum is σ = 408600. Its totient is φ = 108952.

The previous prime is 217909. The next prime is 217933. The reversal of 217912 is 219712.

217912 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13612 + ... + 13627.

It is an arithmetic number, because the mean of its divisors is an integer number (51075).

2²¹⁷⁹¹² is an apocalyptic number.

It is an amenable number.

217912 is a deficient number, since it is larger than the sum of its proper divisors (190688).

217912 is a wasteful number, since it uses less digits than its factorization.

217912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27245 (or 27241 counting only the distinct ones).

The product of its digits is 252, while the sum is 22.

The square root of 217912 is about 466.8104540389. The cubic root of 217912 is about 60.1765172223.

The spelling of 217912 in words is "two hundred seventeen thousand, nine hundred twelve".