215140285 has 8 divisors (see below), whose sum is σ = 258438456. Its totient is φ = 171932160.

The previous prime is 215140273. The next prime is 215140307. The reversal of 215140285 is 582041512.

It can be written as a sum of positive squares in 4 ways, for example, as 71284249 + 143856036 = 8443^2 + 11994^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-215140285 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17136 + ... + 26905.

It is an arithmetic number, because the mean of its divisors is an integer number (32304807).

Almost surely, 2^215140285 is an apocalyptic number.

It is an amenable number.

215140285 is a deficient number, since it is larger than the sum of its proper divisors (43298171).

215140285 is an equidigital number, since it uses as much as digits as its factorization.

215140285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45023.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 215140285 is about 14667.6611973416. The cubic root of 215140285 is about 599.2029091384.

Adding to 215140285 its reverse (582041512), we get a palindrome (797181797).

It can be divided in two parts, 2151 and 40285, that added together give a square (42436 = 206²).

The spelling of 215140285 in words is "two hundred fifteen million, one hundred forty thousand, two hundred eighty-five".