8163985 has 4 divisors (see below), whose sum is σ = 9796788. Its totient is φ = 6531184.

The previous prime is 8163983. The next prime is 8163989. The reversal of 8163985 is 5893618.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5893618 = 2 ⋅2946809.

It can be written as a sum of positive squares in 2 ways, for example, as 1067089 + 7096896 = 1033^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 8163985 - 2¹ = 8163983 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 Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8163983) 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, 816394 + ... + 816403.

It is an arithmetic number, because the mean of its divisors is an integer number (2449197).

Almost surely, 2^8163985 is an apocalyptic number.

It is an amenable number.

8163985 is a deficient number, since it is larger than the sum of its proper divisors (1632803).

8163985 is a wasteful number, since it uses less digits than its factorization.

8163985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632802.

The product of its digits is 51840, while the sum is 40.

The square root of 8163985 is about 2857.2688007956. The cubic root of 8163985 is about 201.3573093849.

The spelling of 8163985 in words is "eight million, one hundred sixty-three thousand, nine hundred eighty-five".