805118 has 4 divisors (see below), whose sum is σ = 1207680. Its totient is φ = 402558.

The previous prime is 805111. The next prime is 805121. The reversal of 805118 is 811508.

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

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 805093 and 805102.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805118.

It is not an unprimeable number, because it can be changed into a prime (805111) by changing a digit.

805118 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 as a sum of consecutive naturals, namely, 201278 + ... + 201281.

It is an arithmetic number, because the mean of its divisors is an integer number (301920).

2⁸⁰⁵¹¹⁸ is an apocalyptic number.

805118 is a deficient number, since it is larger than the sum of its proper divisors (402562).

805118 is a wasteful number, since it uses less digits than its factorization.

805118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402561.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 805118 is about 897.2836786658. The cubic root of 805118 is about 93.0293197723.

The spelling of 805118 in words is "eight hundred five thousand, one hundred eighteen".