805879985 has 32 divisors (see below), whose sum is σ = 1084026240. Its totient is φ = 572156928.

The previous prime is 805879981. The next prime is 805880011. The reversal of 805879985 is 589978508.

It is a cyclic number.

It is not a de Polignac number, because 805879985 - 2² = 805879981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (805879981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102194 + ... + 109796.

It is an arithmetic number, because the mean of its divisors is an integer number (33875820).

Almost surely, 2^805879985 is an apocalyptic number.

805879985 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

805879985 is a deficient number, since it is larger than the sum of its proper divisors (278146255).

805879985 is a wasteful number, since it uses less digits than its factorization.

805879985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7697.

The product of its (nonzero) digits is 7257600, while the sum is 59.

The square root of 805879985 is about 28388.0253804311. The cubic root of 805879985 is about 930.5865898923.

The spelling of 805879985 in words is "eight hundred five million, eight hundred seventy-nine thousand, nine hundred eighty-five".