805818 has 16 divisors (see below), whose sum is σ = 1735776. Its totient is φ = 247920.

The previous prime is 805811. The next prime is 805843. The reversal of 805818 is 818508.

It is not an unprimeable number, because it can be changed into a prime (805811) by changing a digit.

805818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5088 + ... + 5243.

It is an arithmetic number, because the mean of its divisors is an integer number (108486).

2⁸⁰⁵⁸¹⁸ is an apocalyptic number.

805818 is an abundant number, since it is smaller than the sum of its proper divisors (929958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

805818 is a wasteful number, since it uses less digits than its factorization.

805818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349.

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 805818 is about 897.6736600792. The cubic root of 805818 is about 93.0562730306.

The spelling of 805818 in words is "eight hundred five thousand, eight hundred eighteen".