8661845 has 4 divisors (see below), whose sum is σ = 10394220. Its totient is φ = 6929472.

The previous prime is 8661841. The next prime is 8661871. The reversal of 8661845 is 5481668.

8661845 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6345361 + 2316484 = 2519^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661845 - 2² = 8661841 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8661799 and 8661808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661841) 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, 866180 + ... + 866189.

It is an arithmetic number, because the mean of its divisors is an integer number (2598555).

Almost surely, 2^8661845 is an apocalyptic number.

It is an amenable number.

8661845 is a deficient number, since it is larger than the sum of its proper divisors (1732375).

8661845 is a wasteful number, since it uses less digits than its factorization.

8661845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732374.

The product of its digits is 46080, while the sum is 38.

The square root of 8661845 is about 2943.1012554786. The cubic root of 8661845 is about 205.3699052074.

The spelling of 8661845 in words is "eight million, six hundred sixty-one thousand, eight hundred forty-five".