805889 has 4 divisors (see below), whose sum is σ = 921024. Its totient is φ = 690756.

The previous prime is 805877. The next prime is 805891. The reversal of 805889 is 988508.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 805889 - 2⁴ = 805873 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805859) 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, 57557 + ... + 57570.

It is an arithmetic number, because the mean of its divisors is an integer number (230256).

It is a Proth number, since it is equal to 787 ⋅ 2¹⁰ + 1 and 787 < 2¹⁰.

2⁸⁰⁵⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

805889 is a deficient number, since it is larger than the sum of its proper divisors (115135).

805889 is a wasteful number, since it uses less digits than its factorization.

805889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115134.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 805889 is about 897.7132058737. The cubic root of 805889 is about 93.0590059891.

The spelling of 805889 in words is "eight hundred five thousand, eight hundred eighty-nine".