8285821 has 4 divisors (see below), whose sum is σ = 8320444. Its totient is φ = 8251200.

The previous prime is 8285791. The next prime is 8285831. The reversal of 8285821 is 1285828.

It is a happy number.

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 3290596 + 4995225 = 1814^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 8285821 - 2⁵ = 8285789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8285831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16950 + ... + 17431.

It is an arithmetic number, because the mean of its divisors is an integer number (2080111).

Almost surely, 2^8285821 is an apocalyptic number.

It is an amenable number.

8285821 is a deficient number, since it is larger than the sum of its proper divisors (34623).

8285821 is a wasteful number, since it uses less digits than its factorization.

8285821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34622.

The product of its digits is 10240, while the sum is 34.

The square root of 8285821 is about 2878.5102049498. The cubic root of 8285821 is about 202.3540257742.

The spelling of 8285821 in words is "eight million, two hundred eighty-five thousand, eight hundred twenty-one".