845805 has 16 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 446208.

The previous prime is 845777. The next prime is 845809. The reversal of 845805 is 508548.

It is not a de Polignac number, because 845805 - 2¹¹ = 843757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446 + ... + 1944.

It is an arithmetic number, because the mean of its divisors is an integer number (85500).

2⁸⁴⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

845805 is a deficient number, since it is larger than the sum of its proper divisors (522195).

845805 is a wasteful number, since it uses less digits than its factorization.

845805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 845805 is about 919.6765735844. The cubic root of 845805 is about 94.5707317377.

The spelling of 845805 in words is "eight hundred forty-five thousand, eight hundred five".