216423 has 12 divisors (see below), whose sum is σ = 316680. Its totient is φ = 142416.

The previous prime is 216421. The next prime is 216431. The reversal of 216423 is 324612.

It is a happy number.

216423 is a `hidden beast` number, since 21 + 642 + 3 = 666.

It is not a de Polignac number, because 216423 - 2¹ = 216421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216396 and 216405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1165 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (26390).

2²¹⁶⁴²³ is an apocalyptic number.

216423 is a deficient number, since it is larger than the sum of its proper divisors (100257).

216423 is a wasteful number, since it uses less digits than its factorization.

216423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 315 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 216423 is about 465.2128545086. The cubic root of 216423 is about 60.0391411273.

It can be divided in two parts, 2164 and 23, that added together give a 7-th power (2187 = 3⁷).

The spelling of 216423 in words is "two hundred sixteen thousand, four hundred twenty-three".