8683921 has 4 divisors (see below), whose sum is σ = 8763700. Its totient is φ = 8604144.

The previous prime is 8683907. The next prime is 8683933. The reversal of 8683921 is 1293868.

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 5313025 + 3370896 = 2305^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 8683921 - 2⁷ = 8683793 is a prime.

It is a Duffinian number.

8683921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8683321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39726 + ... + 39943.

It is an arithmetic number, because the mean of its divisors is an integer number (2190925).

Almost surely, 2^8683921 is an apocalyptic number.

It is an amenable number.

8683921 is a deficient number, since it is larger than the sum of its proper divisors (79779).

8683921 is a wasteful number, since it uses less digits than its factorization.

8683921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79778.

The product of its digits is 20736, while the sum is 37.

The square root of 8683921 is about 2946.8493344588. The cubic root of 8683921 is about 205.5442291083.

It can be divided in two parts, 8683 and 921, that added together give a square (9604 = 98²).

The spelling of 8683921 in words is "eight million, six hundred eighty-three thousand, nine hundred twenty-one".