6843985 has 4 divisors (see below), whose sum is σ = 8212788. Its totient is φ = 5475184.

The previous prime is 6843961. The next prime is 6843989. The reversal of 6843985 is 5893486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5893486 = 2 ⋅2946743.

It can be written as a sum of positive squares in 2 ways, for example, as 2521744 + 4322241 = 1588^2 + 2079^2 .

It is a cyclic number.

It is not a de Polignac number, because 6843985 - 2⁵ = 6843953 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6³ + 8⁷ + 4¹⁰ + 3¹³ + 9⁴ + 8⁷ + 5 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6843989) 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, 684394 + ... + 684403.

It is an arithmetic number, because the mean of its divisors is an integer number (2053197).

Almost surely, 2^6843985 is an apocalyptic number.

It is an amenable number.

6843985 is a deficient number, since it is larger than the sum of its proper divisors (1368803).

6843985 is a wasteful number, since it uses less digits than its factorization.

6843985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368802.

The product of its digits is 207360, while the sum is 43.

The square root of 6843985 is about 2616.1011066088. The cubic root of 6843985 is about 189.8612560502.

The spelling of 6843985 in words is "six million, eight hundred forty-three thousand, nine hundred eighty-five".