285247 has 4 divisors (see below), whose sum is σ = 300280. Its totient is φ = 270216.

The previous prime is 285227. The next prime is 285251. The reversal of 285247 is 742582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742582 = 2 ⋅371291.

It is a cyclic number.

It is not a de Polignac number, because 285247 - 2⁷ = 285119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7488 + ... + 7525.

It is an arithmetic number, because the mean of its divisors is an integer number (75070).

2²⁸⁵²⁴⁷ is an apocalyptic number.

285247 is a deficient number, since it is larger than the sum of its proper divisors (15033).

285247 is a wasteful number, since it uses less digits than its factorization.

285247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15032.

The product of its digits is 4480, while the sum is 28.

The square root of 285247 is about 534.0851991958. The cubic root of 285247 is about 65.8274494911.

The spelling of 285247 in words is "two hundred eighty-five thousand, two hundred forty-seven".