285487 has 4 divisors (see below), whose sum is σ = 289816. Its totient is φ = 281160.

The previous prime is 285473. The next prime is 285497. The reversal of 285487 is 784582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285487 is a prime.

It is a Duffinian number.

285487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285457) 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, 2064 + ... + 2197.

It is an arithmetic number, because the mean of its divisors is an integer number (72454).

2²⁸⁵⁴⁸⁷ is an apocalyptic number.

285487 is a deficient number, since it is larger than the sum of its proper divisors (4329).

285487 is an equidigital number, since it uses as much as digits as its factorization.

285487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328.

The product of its digits is 17920, while the sum is 34.

The square root of 285487 is about 534.3098352080. The cubic root of 285487 is about 65.8459061959.

The spelling of 285487 in words is "two hundred eighty-five thousand, four hundred eighty-seven".