815285 has 12 divisors (see below), whose sum is σ = 1013124. Its totient is φ = 629760.

The previous prime is 815279. The next prime is 815291. The reversal of 815285 is 582518.

815285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (815279) and next prime (815291).

It can be written as a sum of positive squares in 6 ways, for example, as 306916 + 508369 = 554^2 + 713^2 .

It is not a de Polignac number, because 815285 - 2⁸ = 815029 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8357 + ... + 8453.

It is an arithmetic number, because the mean of its divisors is an integer number (84427).

2⁸¹⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

815285 is a deficient number, since it is larger than the sum of its proper divisors (197839).

815285 is an equidigital number, since it uses as much as digits as its factorization.

815285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 143 counting only the distinct ones).

The product of its digits is 3200, while the sum is 29.

The square root of 815285 is about 902.9313373674. The cubic root of 815285 is about 93.4192731680.

The spelling of 815285 in words is "eight hundred fifteen thousand, two hundred eighty-five".