216852538 has 12 divisors (see below), whose sum is σ = 378385722. Its totient is φ = 92936760.

The previous prime is 216852511. The next prime is 216852539. The reversal of 216852538 is 835258612.

It can be written as a sum of positive squares in only one way, i.e., 149891049 + 66961489 = 12243^2 + 8183^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216852538.

It is not an unprimeable number, because it can be changed into a prime (216852539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106293 + ... + 1106488.

Almost surely, 2^216852538 is an apocalyptic number.

216852538 is a deficient number, since it is larger than the sum of its proper divisors (161533184).

216852538 is a wasteful number, since it uses less digits than its factorization.

216852538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212797 (or 2212790 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 216852538 is about 14725.9138256340. The cubic root of 216852538 is about 600.7883507552.

The spelling of 216852538 in words is "two hundred sixteen million, eight hundred fifty-two thousand, five hundred thirty-eight".