285505 has 16 divisors (see below), whose sum is σ = 388800. Its totient is φ = 199360.

The previous prime is 285497. The next prime is 285517. The reversal of 285505 is 505582.

285505 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 285505 - 2³ = 285497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1506 + ... + 1684.

It is an arithmetic number, because the mean of its divisors is an integer number (24300).

2²⁸⁵⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

285505 is a deficient number, since it is larger than the sum of its proper divisors (103295).

285505 is a wasteful number, since it uses less digits than its factorization.

285505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 285505 is about 534.3266791018. The cubic root of 285505 is about 65.8472900318.

The spelling of 285505 in words is "two hundred eighty-five thousand, five hundred five".