216586238 has 8 divisors (see below), whose sum is σ = 354413880. Its totient is φ = 98448280.

The previous prime is 216586219. The next prime is 216586303. The reversal of 216586238 is 832685612.

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

It is a junction number, because it is equal to n+sod(n) for n = 216586195 and 216586204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4922393 + ... + 4922436.

It is an arithmetic number, because the mean of its divisors is an integer number (44301735).

Almost surely, 2^216586238 is an apocalyptic number.

216586238 is a deficient number, since it is larger than the sum of its proper divisors (137827642).

216586238 is a wasteful number, since it uses less digits than its factorization.

216586238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9844842.

The product of its digits is 138240, while the sum is 41.

The square root of 216586238 is about 14716.8691643298. The cubic root of 216586238 is about 600.5423226256.

The spelling of 216586238 in words is "two hundred sixteen million, five hundred eighty-six thousand, two hundred thirty-eight".