216712 has 16 divisors (see below), whose sum is σ = 411840. Its totient is φ = 106896.

The previous prime is 216703. The next prime is 216719. The reversal of 216712 is 217612.

It is a self number, because there is not a number n which added to its sum of digits gives 216712.

It is not an unprimeable number, because it can be changed into a prime (216719) by changing a digit.

216712 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693 + ... + 955.

It is an arithmetic number, because the mean of its divisors is an integer number (25740).

2²¹⁶⁷¹² is an apocalyptic number.

It is an amenable number.

216712 is a deficient number, since it is larger than the sum of its proper divisors (195128).

216712 is a wasteful number, since it uses less digits than its factorization.

216712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 368 counting only the distinct ones).

The product of its digits is 168, while the sum is 19.

The square root of 216712 is about 465.5233613902. The cubic root of 216712 is about 60.0658536212.

Subtracting 216712 from its reverse (217612), we obtain a square (900 = 30²).

The spelling of 216712 in words is "two hundred sixteen thousand, seven hundred twelve".