804815985 has 16 divisors (see below), whose sum is σ = 1288115136. Its totient is φ = 429098688.

The previous prime is 804815981. The next prime is 804816007. The reversal of 804815985 is 589518408.

It is not a de Polignac number, because 804815985 - 2² = 804815981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (804815981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55902 + ... + 68808.

It is an arithmetic number, because the mean of its divisors is an integer number (80507196).

Almost surely, 2^804815985 is an apocalyptic number.

It is an amenable number.

804815985 is a deficient number, since it is larger than the sum of its proper divisors (483299151).

804815985 is a wasteful number, since it uses less digits than its factorization.

804815985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17072.

The product of its (nonzero) digits is 460800, while the sum is 48.

The square root of 804815985 is about 28369.2788946071. The cubic root of 804815985 is about 930.1768596466.

The spelling of 804815985 in words is "eight hundred four million, eight hundred fifteen thousand, nine hundred eighty-five".