216546 has 32 divisors (see below), whose sum is σ = 502848. Its totient is φ = 61440.

The previous prime is 216523. The next prime is 216551. The reversal of 216546 is 645612.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216546.

It is an unprimeable number.

216546 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 15 ways as a sum of consecutive naturals, for example, 1026 + ... + 1218.

It is an arithmetic number, because the mean of its divisors is an integer number (15714).

2²¹⁶⁵⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216546, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251424).

216546 is an abundant number, since it is smaller than the sum of its proper divisors (286302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216546 is a wasteful number, since it uses less digits than its factorization.

216546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its digits is 1440, while the sum is 24.

The square root of 216546 is about 465.3450332818. The cubic root of 216546 is about 60.0505130175.

It can be divided in two parts, 2165 and 46, that added together give a triangular number (2211 = T₆₆).

The spelling of 216546 in words is "two hundred sixteen thousand, five hundred forty-six".