8705921 has 16 divisors (see below), whose sum is σ = 10627200. Its totient is φ = 6961920.

The previous prime is 8705911. The next prime is 8705923. The reversal of 8705921 is 1295078.

It is not a de Polignac number, because 8705921 - 2¹⁰ = 8704897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8705923) 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, 17486 + ... + 17976.

It is an arithmetic number, because the mean of its divisors is an integer number (664200).

Almost surely, 2^8705921 is an apocalyptic number.

It is an amenable number.

8705921 is a deficient number, since it is larger than the sum of its proper divisors (1921279).

8705921 is a wasteful number, since it uses less digits than its factorization.

8705921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8705921 is about 2950.5797735360. The cubic root of 8705921 is about 205.7176592030.

The spelling of 8705921 in words is "eight million, seven hundred five thousand, nine hundred twenty-one".