216459 has 8 divisors (see below), whose sum is σ = 320720. Its totient is φ = 144288.

The previous prime is 216451. The next prime is 216481. The reversal of 216459 is 954612.

It is not a de Polignac number, because 216459 - 2³ = 216451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8017 = 216459 / (2 + 1 + 6 + 4 + 5 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3982 + ... + 4035.

It is an arithmetic number, because the mean of its divisors is an integer number (40090).

2²¹⁶⁴⁵⁹ is an apocalyptic number.

216459 is a deficient number, since it is larger than the sum of its proper divisors (104261).

216459 is an equidigital number, since it uses as much as digits as its factorization.

216459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8026 (or 8020 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 216459 is about 465.2515448658. The cubic root of 216459 is about 60.0424699313.

It can be divided in two parts, 2 and 16459, that added together give a palindrome (16461).

The spelling of 216459 in words is "two hundred sixteen thousand, four hundred fifty-nine".