285405009 has 12 divisors (see below), whose sum is σ = 388817904. Its totient is φ = 186217384.

The previous prime is 285404983. The next prime is 285405017. The reversal of 285405009 is 900504582.

It is not a de Polignac number, because 285405009 - 2⁸ = 285404753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (285405409) 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 11 ways as a sum of consecutive naturals, for example, 14907 + ... + 28160.

It is an arithmetic number, because the mean of its divisors is an integer number (32401492).

Almost surely, 2^285405009 is an apocalyptic number.

It is an amenable number.

285405009 is a deficient number, since it is larger than the sum of its proper divisors (103412895).

285405009 is an equidigital number, since it uses as much as digits as its factorization.

285405009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43164 (or 43117 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 285405009 is about 16893.9340888971. The cubic root of 285405009 is about 658.3960201092.

The spelling of 285405009 in words is "two hundred eighty-five million, four hundred five thousand, nine".