869845 has 4 divisors (see below), whose sum is σ = 1043820. Its totient is φ = 695872.

The previous prime is 869819. The next prime is 869849. The reversal of 869845 is 548968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 293764 = 759^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 869845 - 2⁷ = 869717 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 869798 and 869807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86980 + ... + 86989.

It is an arithmetic number, because the mean of its divisors is an integer number (260955).

2⁸⁶⁹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

869845 is a deficient number, since it is larger than the sum of its proper divisors (173975).

869845 is a wasteful number, since it uses less digits than its factorization.

869845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173974.

The product of its digits is 69120, while the sum is 40.

The square root of 869845 is about 932.6548128863. The cubic root of 869845 is about 95.4583574373.

The spelling of 869845 in words is "eight hundred sixty-nine thousand, eight hundred forty-five".