305285 has 4 divisors (see below), whose sum is σ = 366348. Its totient is φ = 244224.

The previous prime is 305281. The next prime is 305297. The reversal of 305285 is 582503.

305285 = 318² + 319² + 320².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582503 = 311 ⋅1873.

It can be written as a sum of positive squares in 2 ways, for example, as 201601 + 103684 = 449^2 + 322^2 .

It is a cyclic number.

It is not a de Polignac number, because 305285 - 2² = 305281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 305285.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 305285.

It is not an unprimeable number, because it can be changed into a prime (305281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30524 + ... + 30533.

It is an arithmetic number, because the mean of its divisors is an integer number (91587).

2³⁰⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

305285 is a deficient number, since it is larger than the sum of its proper divisors (61063).

305285 is an equidigital number, since it uses as much as digits as its factorization.

305285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61062.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 305285 is about 552.5260174870. The cubic root of 305285 is about 67.3341148381.

Adding to 305285 its reverse (582503), we get a palindrome (887788).

The spelling of 305285 in words is "three hundred five thousand, two hundred eighty-five".