8001685 has 4 divisors (see below), whose sum is σ = 9602028. Its totient is φ = 6401344.

The previous prime is 8001667. The next prime is 8001727. The reversal of 8001685 is 5861008.

It is a happy number.

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 5574321 + 2427364 = 2361^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 8001685 - 2⁹ = 8001173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 800164 + ... + 800173.

It is an arithmetic number, because the mean of its divisors is an integer number (2400507).

Almost surely, 2^8001685 is an apocalyptic number.

It is an amenable number.

8001685 is a deficient number, since it is larger than the sum of its proper divisors (1600343).

8001685 is a wasteful number, since it uses less digits than its factorization.

8001685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600342.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 8001685 is about 2828.7249777948. The cubic root of 8001685 is about 200.0140406809.

It can be divided in two parts, 800 and 1685, that added together give a triangular number (2485 = T₇₀).

The spelling of 8001685 in words is "eight million, one thousand, six hundred eighty-five".