805605 has 16 divisors (see below), whose sum is σ = 1320000. Its totient is φ = 419328.

The previous prime is 805589. The next prime is 805633. The reversal of 805605 is 506508.

805605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 805605 - 2⁴ = 805589 is a prime.

805605 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21 + ... + 1269.

It is an arithmetic number, because the mean of its divisors is an integer number (82500).

2⁸⁰⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

805605 is a deficient number, since it is larger than the sum of its proper divisors (514395).

805605 is a wasteful number, since it uses less digits than its factorization.

805605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 805605 is about 897.5550122416. Note that the first 3 decimals coincide. The cubic root of 805605 is about 93.0480731919.

The spelling of 805605 in words is "eight hundred five thousand, six hundred five".