8644921 has 4 divisors (see below), whose sum is σ = 8653392. Its totient is φ = 8636452.

The previous prime is 8644919. The next prime is 8644927. The reversal of 8644921 is 1294468.

8644921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8644921 - 2¹ = 8644919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8644927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2455 + ... + 4828.

It is an arithmetic number, because the mean of its divisors is an integer number (2163348).

Almost surely, 2^8644921 is an apocalyptic number.

It is an amenable number.

8644921 is a deficient number, since it is larger than the sum of its proper divisors (8471).

8644921 is a wasteful number, since it uses less digits than its factorization.

8644921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8470.

The product of its digits is 13824, while the sum is 34.

The square root of 8644921 is about 2940.2246512809. The cubic root of 8644921 is about 205.2360635760.

The spelling of 8644921 in words is "eight million, six hundred forty-four thousand, nine hundred twenty-one".