8685921 has 16 divisors (see below), whose sum is σ = 12165120. Its totient is φ = 5505360.

The previous prime is 8685917. The next prime is 8685923. The reversal of 8685921 is 1295868.

It is not a de Polignac number, because 8685921 - 2² = 8685917 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8685921.

It is not an unprimeable number, because it can be changed into a prime (8685923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4696 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (760320).

Almost surely, 2^8685921 is an apocalyptic number.

It is an amenable number.

8685921 is a deficient number, since it is larger than the sum of its proper divisors (3479199).

8685921 is a wasteful number, since it uses less digits than its factorization.

8685921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its digits is 34560, while the sum is 39.

The square root of 8685921 is about 2947.1886604016. The cubic root of 8685921 is about 205.5600075761.

The spelling of 8685921 in words is "eight million, six hundred eighty-five thousand, nine hundred twenty-one".