805219993 has 4 divisors (see below), whose sum is σ = 805552308. Its totient is φ = 804887680.

The previous prime is 805219979. The next prime is 805219997. The reversal of 805219993 is 399912508.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36156169 + 769063824 = 6013^2 + 27732^2 .

It is a cyclic number.

It is not a de Polignac number, because 805219993 - 2²¹ = 803122841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805219997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162496 + ... + 167377.

It is an arithmetic number, because the mean of its divisors is an integer number (201388077).

Almost surely, 2^805219993 is an apocalyptic number.

It is an amenable number.

805219993 is a deficient number, since it is larger than the sum of its proper divisors (332315).

805219993 is a wasteful number, since it uses less digits than its factorization.

805219993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332314.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 805219993 is about 28376.3985206016. The cubic root of 805219993 is about 930.3324794964.

The spelling of 805219993 in words is "eight hundred five million, two hundred nineteen thousand, nine hundred ninety-three".