215838985 has 8 divisors (see below), whose sum is σ = 259089480. Its totient is φ = 172616064.

The previous prime is 215838943. The next prime is 215838989. The reversal of 215838985 is 589838512.

215838985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43599609 + 172239376 = 6603^2 + 13124^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 215838985 - 2¹⁷ = 215707913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215838989) 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, 19581 + ... + 28549.

It is an arithmetic number, because the mean of its divisors is an integer number (32386185).

Almost surely, 2^215838985 is an apocalyptic number.

It is an amenable number.

215838985 is a deficient number, since it is larger than the sum of its proper divisors (43250495).

215838985 is an equidigital number, since it uses as much as digits as its factorization.

215838985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13787.

The product of its digits is 691200, while the sum is 49.

The square root of 215838985 is about 14691.4595939274. The cubic root of 215838985 is about 599.8508749763.

The spelling of 215838985 in words is "two hundred fifteen million, eight hundred thirty-eight thousand, nine hundred eighty-five".