8172985 has 4 divisors (see below), whose sum is σ = 9807588. Its totient is φ = 6538384.

The previous prime is 8172979. The next prime is 8172991. The reversal of 8172985 is 5892718.

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

It is an interprime number because it is at equal distance from previous prime (8172979) and next prime (8172991).

It can be written as a sum of positive squares in 2 ways, for example, as 4108729 + 4064256 = 2027^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172985 - 2⁵ = 8172953 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817294 + ... + 817303.

It is an arithmetic number, because the mean of its divisors is an integer number (2451897).

Almost surely, 2^8172985 is an apocalyptic number.

It is an amenable number.

8172985 is a deficient number, since it is larger than the sum of its proper divisors (1634603).

8172985 is a wasteful number, since it uses less digits than its factorization.

8172985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634602.

The product of its digits is 40320, while the sum is 40.

The square root of 8172985 is about 2858.8432975593. The cubic root of 8172985 is about 201.4312744996.

The spelling of 8172985 in words is "eight million, one hundred seventy-two thousand, nine hundred eighty-five".