216845 has 8 divisors (see below), whose sum is σ = 268800. Its totient is φ = 167760.

The previous prime is 216841. The next prime is 216851. The reversal of 216845 is 548612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216845 - 2² = 216841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216841) 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, 545 + ... + 854.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2²¹⁶⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

216845 is a deficient number, since it is larger than the sum of its proper divisors (51955).

216845 is a wasteful number, since it uses less digits than its factorization.

216845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435.

The product of its digits is 1920, while the sum is 26.

The square root of 216845 is about 465.6661894533. Note that the first 3 decimals coincide. The cubic root of 216845 is about 60.0781389350.

The spelling of 216845 in words is "two hundred sixteen thousand, eight hundred forty-five".