216387 has 6 divisors (see below), whose sum is σ = 312572. Its totient is φ = 144252.

The previous prime is 216379. The next prime is 216397. The reversal of 216387 is 783612.

216387 is a `hidden beast` number, since 21 + 638 + 7 = 666.

216387 is nontrivially palindromic in base 16.

216387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216387 - 2³ = 216379 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 216387.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216387.

It is not an unprimeable number, because it can be changed into a prime (216317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12013 + ... + 12030.

2²¹⁶³⁸⁷ is an apocalyptic number.

216387 is a deficient number, since it is larger than the sum of its proper divisors (96185).

216387 is a wasteful number, since it uses less digits than its factorization.

216387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24049 (or 24046 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 216387 is about 465.1741609333. The cubic root of 216387 is about 60.0358119541.

Adding to 216387 its reverse (783612), we get a palindrome (999999).

The spelling of 216387 in words is "two hundred sixteen thousand, three hundred eighty-seven".