285500405 has 8 divisors (see below), whose sum is σ = 343440600. Its totient is φ = 227840256.

The previous prime is 285500401. The next prime is 285500407. The reversal of 285500405 is 504005582.

It can be written as a sum of positive squares in 4 ways, for example, as 165225316 + 120275089 = 12854^2 + 10967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285500405 - 2² = 285500401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285500401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67760 + ... + 71849.

It is an arithmetic number, because the mean of its divisors is an integer number (42930075).

Almost surely, 2^285500405 is an apocalyptic number.

It is an amenable number.

285500405 is a deficient number, since it is larger than the sum of its proper divisors (57940195).

285500405 is a wasteful number, since it uses less digits than its factorization.

285500405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140023.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 285500405 is about 16896.7572332682. The cubic root of 285500405 is about 658.4693677476.

Adding to 285500405 its reverse (504005582), we get a palindrome (789505987).

The spelling of 285500405 in words is "two hundred eighty-five million, five hundred thousand, four hundred five".