216427239 has 24 divisors (see below), whose sum is σ = 360565920. Its totient is φ = 122534208.

The previous prime is 216427223. The next prime is 216427247. The reversal of 216427239 is 932724612.

216427239 is a `hidden beast` number, since 2 + 1 + 642 + 7 + 2 + 3 + 9 = 666.

It is not a de Polignac number, because 216427239 - 2⁴ = 216427223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216427279) 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 23 ways as a sum of consecutive naturals, for example, 8892 + ... + 22625.

It is an arithmetic number, because the mean of its divisors is an integer number (15023580).

Almost surely, 2^216427239 is an apocalyptic number.

216427239 is a deficient number, since it is larger than the sum of its proper divisors (144138681).

216427239 is a wasteful number, since it uses less digits than its factorization.

216427239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31639 (or 31636 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 216427239 is about 14711.4662423567. The cubic root of 216427239 is about 600.3953311316.

It can be divided in two parts, 2164 and 27239, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 216427239 in words is "two hundred sixteen million, four hundred twenty-seven thousand, two hundred thirty-nine".