805890 has 16 divisors (see below), whose sum is σ = 1934208. Its totient is φ = 214896.

The previous prime is 805877. The next prime is 805891. The reversal of 805890 is 98508.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 26863 = 805890 / (8 + 0 + 5 + 8 + 9 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (805891) 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, 13402 + ... + 13461.

It is an arithmetic number, because the mean of its divisors is an integer number (120888).

2⁸⁰⁵⁸⁹⁰ is an apocalyptic number.

805890 is an abundant number, since it is smaller than the sum of its proper divisors (1128318).

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

805890 is a wasteful number, since it uses less digits than its factorization.

805890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26873.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 805890 is about 897.7137628443. The cubic root of 805890 is about 93.0590444803.

The spelling of 805890 in words is "eight hundred five thousand, eight hundred ninety".