285685939 has 16 divisors (see below), whose sum is σ = 356564736. Its totient is φ = 222372000.

The previous prime is 285685927. The next prime is 285685943. The reversal of 285685939 is 939586582.

It is a cyclic number.

It is not a de Polignac number, because 285685939 - 2⁷ = 285685811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285685939.

It is not an unprimeable number, because it can be changed into a prime (285685949) 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 15 ways as a sum of consecutive naturals, for example, 110449 + ... + 113005.

It is an arithmetic number, because the mean of its divisors is an integer number (22285296).

Almost surely, 2^285685939 is an apocalyptic number.

285685939 is a deficient number, since it is larger than the sum of its proper divisors (70878797).

285685939 is a wasteful number, since it uses less digits than its factorization.

285685939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026.

The product of its digits is 4665600, while the sum is 55.

The square root of 285685939 is about 16902.2465666550. The cubic root of 285685939 is about 658.6119735012.

The spelling of 285685939 in words is "two hundred eighty-five million, six hundred eighty-five thousand, nine hundred thirty-nine".