216839727 has 16 divisors (see below), whose sum is σ = 345955680. Its totient is φ = 133439616.

The previous prime is 216839713. The next prime is 216839731. The reversal of 216839727 is 727938612.

It is not a de Polignac number, because 216839727 - 2¹² = 216835631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216839737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308538 + ... + 309239.

It is an arithmetic number, because the mean of its divisors is an integer number (21622230).

Almost surely, 2^216839727 is an apocalyptic number.

216839727 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216839727 is a deficient number, since it is larger than the sum of its proper divisors (129115953).

216839727 is a wasteful number, since it uses less digits than its factorization.

216839727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617799 (or 617793 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 216839727 is about 14725.4788377153. The cubic root of 216839727 is about 600.7765195953.

The spelling of 216839727 in words is "two hundred sixteen million, eight hundred thirty-nine thousand, seven hundred twenty-seven".