216398 has 32 divisors (see below), whose sum is σ = 423360. Its totient is φ = 80640.

The previous prime is 216397. The next prime is 216401. The reversal of 216398 is 893612.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 216398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5258 + ... + 5298.

It is an arithmetic number, because the mean of its divisors is an integer number (13230).

2²¹⁶³⁹⁸ is an apocalyptic number.

216398 is a deficient number, since it is larger than the sum of its proper divisors (206962).

216398 is a wasteful number, since it uses less digits than its factorization.

216398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92.

The product of its digits is 2592, while the sum is 29.

The square root of 216398 is about 465.1859843117. The cubic root of 216398 is about 60.0368292407.

The spelling of 216398 in words is "two hundred sixteen thousand, three hundred ninety-eight".