8087821 has 4 divisors (see below), whose sum is σ = 9243232. Its totient is φ = 6932412.

The previous prime is 8087819. The next prime is 8087861. The reversal of 8087821 is 1287808.

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.

It is a cyclic number.

It is not a de Polignac number, because 8087821 - 2¹ = 8087819 is a prime.

It is a Duffinian number.

8087821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8087861) 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, 577695 + ... + 577708.

It is an arithmetic number, because the mean of its divisors is an integer number (2310808).

Almost surely, 2^8087821 is an apocalyptic number.

It is an amenable number.

8087821 is a deficient number, since it is larger than the sum of its proper divisors (1155411).

8087821 is a wasteful number, since it uses less digits than its factorization.

8087821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155410.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 8087821 is about 2843.9094570679. The cubic root of 8087821 is about 200.7291799190.

The spelling of 8087821 in words is "eight million, eighty-seven thousand, eight hundred twenty-one".