8644421 has 8 divisors (see below), whose sum is σ = 8937600. Its totient is φ = 8354448.

The previous prime is 8644397. The next prime is 8644439. The reversal of 8644421 is 1244468.

8644421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8644421 - 2¹⁸ = 8382277 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5480 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (1117200).

Almost surely, 2^8644421 is an apocalyptic number.

It is an amenable number.

8644421 is a deficient number, since it is larger than the sum of its proper divisors (293179).

8644421 is a wasteful number, since it uses less digits than its factorization.

8644421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

The product of its digits is 6144, while the sum is 29.

The square root of 8644421 is about 2940.1396225350. The cubic root of 8644421 is about 205.2321067244.

Adding to 8644421 its reverse (1244468), we get a palindrome (9888889).

The spelling of 8644421 in words is "eight million, six hundred forty-four thousand, four hundred twenty-one".