845861 has 4 divisors (see below), whose sum is σ = 890400. Its totient is φ = 801324.

The previous prime is 845849. The next prime is 845863. The reversal of 845861 is 168548.

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 a de Polignac number, because none of the positive numbers 2^k-845861 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 (845863) 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, 22241 + ... + 22278.

It is an arithmetic number, because the mean of its divisors is an integer number (222600).

2⁸⁴⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

845861 is a deficient number, since it is larger than the sum of its proper divisors (44539).

845861 is a wasteful number, since it uses less digits than its factorization.

845861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44538.

The product of its digits is 7680, while the sum is 32.

The square root of 845861 is about 919.7070185662. The cubic root of 845861 is about 94.5728188398.

The spelling of 845861 in words is "eight hundred forty-five thousand, eight hundred sixty-one".