285105 has 16 divisors (see below), whose sum is σ = 463680. Its totient is φ = 149568.

The previous prime is 285101. The next prime is 285113. The reversal of 285105 is 501582.

It is not a de Polignac number, because 285105 - 2² = 285101 is a prime.

It is a super-2 number, since 2×285105² = 162569722050, which contains 22 as substring.

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 285105.

It is not an unprimeable number, because it can be changed into a prime (285101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1131 + ... + 1359.

It is an arithmetic number, because the mean of its divisors is an integer number (28980).

2²⁸⁵¹⁰⁵ is an apocalyptic number.

It is an amenable number.

285105 is a deficient number, since it is larger than the sum of its proper divisors (178575).

285105 is a wasteful number, since it uses less digits than its factorization.

285105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 285105 is about 533.9522450557. The cubic root of 285105 is about 65.8165243988.

Adding to 285105 its reverse (501582), we get a palindrome (786687).

The spelling of 285105 in words is "two hundred eighty-five thousand, one hundred five".