805989 has 8 divisors (see below), whose sum is σ = 1121472. Its totient is φ = 513920.

The previous prime is 805967. The next prime is 805991. The reversal of 805989 is 989508.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805989 is a prime.

805989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5772 + ... + 5909.

It is an arithmetic number, because the mean of its divisors is an integer number (140184).

2⁸⁰⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

805989 is a deficient number, since it is larger than the sum of its proper divisors (315483).

805989 is a wasteful number, since it uses less digits than its factorization.

805989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11707.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 805989 is about 897.7689012212. The cubic root of 805989 is about 93.0628549541.

The spelling of 805989 in words is "eight hundred five thousand, nine hundred eighty-nine".