216346 has 16 divisors (see below), whose sum is σ = 358344. Its totient is φ = 97344.

The previous prime is 216329. The next prime is 216347. The reversal of 216346 is 643612.

216346 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 4 ways, for example, as 151321 + 65025 = 389^2 + 255^2 .

It is an Ulam number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216347) by changing a digit.

216346 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 7 ways as a sum of consecutive naturals, for example, 1300 + ... + 1456.

2²¹⁶³⁴⁶ is an apocalyptic number.

216346 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216346 is a deficient number, since it is larger than the sum of its proper divisors (141998).

216346 is a wasteful number, since it uses less digits than its factorization.

216346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 864, while the sum is 22.

The square root of 216346 is about 465.1300893299. The cubic root of 216346 is about 60.0320199460.

Adding to 216346 its reverse (643612), we get a palindrome (859958).

It can be divided in two parts, 2163 and 46, that added together give a square (2209 = 47²).

The spelling of 216346 in words is "two hundred sixteen thousand, three hundred forty-six".