8266821 has 8 divisors (see below), whose sum is σ = 11501760. Its totient is φ = 5271552.

The previous prime is 8266807. The next prime is 8266829. The reversal of 8266821 is 1286628.

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

It is not a de Polignac number, because 8266821 - 2⁹ = 8266309 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8266829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59836 + ... + 59973.

It is an arithmetic number, because the mean of its divisors is an integer number (1437720).

Almost surely, 2^8266821 is an apocalyptic number.

It is an amenable number.

8266821 is a deficient number, since it is larger than the sum of its proper divisors (3234939).

8266821 is a wasteful number, since it uses less digits than its factorization.

8266821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119835.

The product of its digits is 9216, while the sum is 33.

The square root of 8266821 is about 2875.2079924764. The cubic root of 8266821 is about 202.1992364867.

The spelling of 8266821 in words is "eight million, two hundred sixty-six thousand, eight hundred twenty-one".