216465 has 8 divisors (see below), whose sum is σ = 346368. Its totient is φ = 115440.

The previous prime is 216451. The next prime is 216481. The reversal of 216465 is 564612.

216465 = T₁₄₆ + T₁₄₇ + ... + T₁₆₃.

216465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216465 - 2⁶ = 216401 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7201 + ... + 7230.

It is an arithmetic number, because the mean of its divisors is an integer number (43296).

2²¹⁶⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

216465 is a deficient number, since it is larger than the sum of its proper divisors (129903).

216465 is a wasteful number, since it uses less digits than its factorization.

216465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14439.

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

The square root of 216465 is about 465.2579929458. The cubic root of 216465 is about 60.0430246961.

The spelling of 216465 in words is "two hundred sixteen thousand, four hundred sixty-five".