216396839 has 4 divisors (see below), whose sum is σ = 216831000. Its totient is φ = 215962680.

The previous prime is 216396823. The next prime is 216396841. The reversal of 216396839 is 938693612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216396839 - 2⁴ = 216396823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216396793 and 216396802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216396899) 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, 216332 + ... + 217329.

It is an arithmetic number, because the mean of its divisors is an integer number (54207750).

Almost surely, 2^216396839 is an apocalyptic number.

216396839 is a deficient number, since it is larger than the sum of its proper divisors (434161).

216396839 is an equidigital number, since it uses as much as digits as its factorization.

216396839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434160.

The product of its digits is 419904, while the sum is 47.

The square root of 216396839 is about 14710.4329983859. The cubic root of 216396839 is about 600.3672187233.

The spelling of 216396839 in words is "two hundred sixteen million, three hundred ninety-six thousand, eight hundred thirty-nine".