216369 has 12 divisors (see below), whose sum is σ = 323700. Its totient is φ = 139104.

The previous prime is 216347. The next prime is 216371. The reversal of 216369 is 963612.

It is a happy number.

216369 is a `hidden beast` number, since 21 + 636 + 9 = 666.

216369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 97344 = 345^2 + 312^2 .

It is not a de Polignac number, because 216369 - 2⁸ = 216113 is a prime.

It is a super-2 number, since 2×216369² = 93631088322, which contains 22 as substring.

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

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216369.

It is not an unprimeable number, because it can be changed into a prime (216319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154 + ... + 675.

It is an arithmetic number, because the mean of its divisors is an integer number (26975).

2²¹⁶³⁶⁹ is an apocalyptic number.

216369 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

216369 is a deficient number, since it is larger than the sum of its proper divisors (107331).

216369 is a wasteful number, since it uses less digits than its factorization.

216369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 861 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 216369 is about 465.1548129387. The cubic root of 216369 is about 60.0341472291.

It can be divided in two parts, 216 and 369, that added together give a palindrome (585).

The spelling of 216369 in words is "two hundred sixteen thousand, three hundred sixty-nine".