216379 has 2 divisors, whose sum is σ = 216380. Its totient is φ = 216378.

The previous prime is 216373. The next prime is 216397. The reversal of 216379 is 973612.

Together with next prime (216397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216379 - 2³ = 216371 is a prime.

It is not a weakly prime, because it can be changed into another prime (216371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108189 + 108190.

It is an arithmetic number, because the mean of its divisors is an integer number (108190).

2²¹⁶³⁷⁹ is an apocalyptic number.

216379 is a deficient number, since it is larger than the sum of its proper divisors (1).

216379 is an equidigital number, since it uses as much as digits as its factorization.

216379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 216379 is about 465.1655619239. The cubic root of 216379 is about 60.0350720877.

It can be divided in two parts, 216 and 379, that added together give a palindrome (595).

The spelling of 216379 in words is "two hundred sixteen thousand, three hundred seventy-nine".