853993805 has 18 divisors (see below), whose sum is σ = 1192744494. Its totient is φ = 585282096.

The previous prime is 853993799. The next prime is 853993813. The reversal of 853993805 is 508399358.

It can be written as a sum of positive squares in only one way, i.e., 683195044 + 170798761 = 26138^2 + 13069^2 .

It is not a de Polignac number, because 853993805 - 2¹⁰ = 853992781 is a prime.

It is a Duffinian number.

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 456482 + ... + 458348.

It is an arithmetic number, because the mean of its divisors is an integer number (66263583).

Almost surely, 2^853993805 is an apocalyptic number.

It is an amenable number.

853993805 is a deficient number, since it is larger than the sum of its proper divisors (338750689).

853993805 is an frugal number, since it uses more digits than its factorization.

853993805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 1879 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 853993805 is about 29223.1723979448. The cubic root of 853993805 is about 948.7495292616.

The spelling of 853993805 in words is "eight hundred fifty-three million, nine hundred ninety-three thousand, eight hundred five".