8364821 has 2 divisors, whose sum is σ = 8364822. Its totient is φ = 8364820.

The previous prime is 8364793. The next prime is 8364827. The reversal of 8364821 is 1284638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5354596 + 3010225 = 2314^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 8364821 - 2¹⁴ = 8348437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8364827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182410 + 4182411.

It is an arithmetic number, because the mean of its divisors is an integer number (4182411).

Almost surely, 2^8364821 is an apocalyptic number.

It is an amenable number.

8364821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8364821 is an equidigital number, since it uses as much as digits as its factorization.

8364821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 8364821 is about 2892.2000276606. The cubic root of 8364821 is about 202.9950980398.

The spelling of 8364821 in words is "eight million, three hundred sixty-four thousand, eight hundred twenty-one".