8384521 has 4 divisors (see below), whose sum is σ = 8400132. Its totient is φ = 8368912.

The previous prime is 8384503. The next prime is 8384531. The reversal of 8384521 is 1254838.

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 4562496 + 3822025 = 2136^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8384521 - 2¹⁵ = 8351753 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8384501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6970 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (2100033).

Almost surely, 2^8384521 is an apocalyptic number.

It is an amenable number.

8384521 is a deficient number, since it is larger than the sum of its proper divisors (15611).

8384521 is a wasteful number, since it uses less digits than its factorization.

8384521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15610.

The product of its digits is 7680, while the sum is 31.

The square root of 8384521 is about 2895.6037367016. The cubic root of 8384521 is about 203.1543311017.

The spelling of 8384521 in words is "eight million, three hundred eighty-four thousand, five hundred twenty-one".