216706 has 16 divisors (see below), whose sum is σ = 388224. Its totient is φ = 88704.

The previous prime is 216703. The next prime is 216719. The reversal of 216706 is 607612.

It is a super-2 number, since 2×216706² = 93922980872, which contains 22 as substring.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (216703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15 + ... + 658.

It is an arithmetic number, because the mean of its divisors is an integer number (24264).

2²¹⁶⁷⁰⁶ is an apocalyptic number.

216706 is a deficient number, since it is larger than the sum of its proper divisors (171518).

216706 is a wasteful number, since it uses less digits than its factorization.

216706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 216706 is about 465.5169169858. The cubic root of 216706 is about 60.0652992780.

The spelling of 216706 in words is "two hundred sixteen thousand, seven hundred six".