216839530 has 16 divisors (see below), whose sum is σ = 391272840. Its totient is φ = 86522112.

The previous prime is 216839527. The next prime is 216839531. The reversal of 216839530 is 35938612.

It can be written as a sum of positive squares in 4 ways, for example, as 215825481 + 1014049 = 14691^2 + 1007^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216839530.

It is not an unprimeable number, because it can be changed into a prime (216839531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22419 + ... + 30598.

Almost surely, 2^216839530 is an apocalyptic number.

216839530 is a deficient number, since it is larger than the sum of its proper divisors (174433310).

216839530 is a wasteful number, since it uses less digits than its factorization.

216839530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53433.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 216839530 is about 14725.4721486274. The cubic root of 216839530 is about 600.7763376591.

It can be divided in two parts, 21683 and 9530, that added together give a palindrome (31213).

The spelling of 216839530 in words is "two hundred sixteen million, eight hundred thirty-nine thousand, five hundred thirty".