805990 has 8 divisors (see below), whose sum is σ = 1450800. Its totient is φ = 322392.

The previous prime is 805967. The next prime is 805991. The reversal of 805990 is 99508.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805991) 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, 40290 + ... + 40309.

It is an arithmetic number, because the mean of its divisors is an integer number (181350).

2⁸⁰⁵⁹⁹⁰ is an apocalyptic number.

805990 is a deficient number, since it is larger than the sum of its proper divisors (644810).

805990 is a wasteful number, since it uses less digits than its factorization.

805990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80606.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 805990 is about 897.7694581573. The cubic root of 805990 is about 93.0628934421.

The spelling of 805990 in words is "eight hundred five thousand, nine hundred ninety".