8185640 has 16 divisors (see below), whose sum is σ = 18417780. Its totient is φ = 3274240.

The previous prime is 8185633. The next prime is 8185649. The reversal of 8185640 is 465818.

It can be written as a sum of positive squares in 2 ways, for example, as 6853924 + 1331716 = 2618^2 + 1154^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8185597 and 8185606.

It is not an unprimeable number, because it can be changed into a prime (8185649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102281 + ... + 102360.

Almost surely, 2^8185640 is an apocalyptic number.

It is an amenable number.

8185640 is an abundant number, since it is smaller than the sum of its proper divisors (10232140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8185640 is a wasteful number, since it uses less digits than its factorization.

8185640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204652 (or 204648 counting only the distinct ones).

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

The square root of 8185640 is about 2861.0557491947. The cubic root of 8185640 is about 201.5351858707.

The spelling of 8185640 in words is "eight million, one hundred eighty-five thousand, six hundred forty".