216956 has 12 divisors (see below), whose sum is σ = 385392. Its totient is φ = 106848.

The previous prime is 216947. The next prime is 216967. The reversal of 216956 is 659612.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216956.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (32116).

2²¹⁶⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

216956 is a deficient number, since it is larger than the sum of its proper divisors (168436).

216956 is a wasteful number, since it uses less digits than its factorization.

216956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 818 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 216956 is about 465.7853582929. The cubic root of 216956 is about 60.0883882465.

The spelling of 216956 in words is "two hundred sixteen thousand, nine hundred fifty-six".