216830 has 8 divisors (see below), whose sum is σ = 390312. Its totient is φ = 86728.

The previous prime is 216829. The next prime is 216841. The reversal of 216830 is 38612.

216830 = T₂₉₂ + T₂₉₃ + ... + T₂₉₆.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10832 + ... + 10851.

It is an arithmetic number, because the mean of its divisors is an integer number (48789).

2²¹⁶⁸³⁰ is an apocalyptic number.

216830 is a deficient number, since it is larger than the sum of its proper divisors (173482).

216830 is a wasteful number, since it uses less digits than its factorization.

216830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21690.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 216830 is about 465.6500832170. The cubic root of 216830 is about 60.0767536247.

The spelling of 216830 in words is "two hundred sixteen thousand, eight hundred thirty".