805011993 has 16 divisors (see below), whose sum is σ = 1196457600. Its totient is φ = 534943440.

The previous prime is 805011973. The next prime is 805012001. The reversal of 805011993 is 399110508.

It is a happy number.

It is not a de Polignac number, because 805011993 - 2⁸ = 805011737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (805011913) by changing a digit.

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, 39538 + ... + 56331.

It is an arithmetic number, because the mean of its divisors is an integer number (74778600).

Almost surely, 2^805011993 is an apocalyptic number.

It is an amenable number.

805011993 is a deficient number, since it is larger than the sum of its proper divisors (391445607).

805011993 is a wasteful number, since it uses less digits than its factorization.

805011993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96189 (or 96183 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 805011993 is about 28372.7332662893. The cubic root of 805011993 is about 930.2523664748.

The spelling of 805011993 in words is "eight hundred five million, eleven thousand, nine hundred ninety-three".