216458 has 8 divisors (see below), whose sum is σ = 354240. Its totient is φ = 98380.

The previous prime is 216451. The next prime is 216481. The reversal of 216458 is 854612.

216458 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 a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216458.

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 3 ways as a sum of consecutive naturals, for example, 4898 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (44280).

2²¹⁶⁴⁵⁸ is an apocalyptic number.

216458 is a deficient number, since it is larger than the sum of its proper divisors (137782).

216458 is a wasteful number, since it uses less digits than its factorization.

216458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9852.

The product of its digits is 1920, while the sum is 26.

The square root of 216458 is about 465.2504701771. The cubic root of 216458 is about 60.0423774695.

It can be divided in two parts, 2164 and 58, that added together give a palindrome (2222).

The spelling of 216458 in words is "two hundred sixteen thousand, four hundred fifty-eight".