812843985 has 16 divisors (see below), whose sum is σ = 1303049664. Its totient is φ = 432683712.

The previous prime is 812843981. The next prime is 812844013. The reversal of 812843985 is 589348218.

It is not a de Polignac number, because 812843985 - 2² = 812843981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812843981) 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, 43962 + ... + 59651.

It is an arithmetic number, because the mean of its divisors is an integer number (81440604).

Almost surely, 2^812843985 is an apocalyptic number.

It is an amenable number.

812843985 is a deficient number, since it is larger than the sum of its proper divisors (490205679).

812843985 is a wasteful number, since it uses less digits than its factorization.

812843985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104144.

The product of its digits is 552960, while the sum is 48.

The square root of 812843985 is about 28510.4188850322. The cubic root of 812843985 is about 933.2594555328.

The spelling of 812843985 in words is "eight hundred twelve million, eight hundred forty-three thousand, nine hundred eighty-five".