805609 has 12 divisors (see below), whose sum is σ = 962388. Its totient is φ = 672000.

The previous prime is 805589. The next prime is 805633. The reversal of 805609 is 906508.

805609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 451584 + 354025 = 672^2 + 595^2 .

It is not a de Polignac number, because 805609 - 2⁹ = 805097 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (805639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1809 + ... + 2209.

It is an arithmetic number, because the mean of its divisors is an integer number (80199).

2⁸⁰⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

805609 is a deficient number, since it is larger than the sum of its proper divisors (156779).

805609 is a wasteful number, since it uses less digits than its factorization.

805609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 805609 is about 897.5572405145. The cubic root of 805609 is about 93.0482271928.

The spelling of 805609 in words is "eight hundred five thousand, six hundred nine".