865803985 has 16 divisors (see below), whose sum is σ = 1052352000. Its totient is φ = 683776576.

The previous prime is 865803979. The next prime is 865804007. The reversal of 865803985 is 589308568.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 865803985 - 2⁷ = 865803857 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120936 + ... + 127894.

It is an arithmetic number, because the mean of its divisors is an integer number (65772000).

Almost surely, 2^865803985 is an apocalyptic number.

It is an amenable number.

865803985 is a deficient number, since it is larger than the sum of its proper divisors (186548015).

865803985 is a wasteful number, since it uses less digits than its factorization.

865803985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The square root of 865803985 is about 29424.5473202223. The cubic root of 865803985 is about 953.1030517709.

The spelling of 865803985 in words is "eight hundred sixty-five million, eight hundred three thousand, nine hundred eighty-five".