8227821 has 8 divisors (see below), whose sum is σ = 12537664. Its totient is φ = 4701600.

The previous prime is 8227819. The next prime is 8227829. The reversal of 8227821 is 1287228.

It is a happy number.

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

It is not a de Polignac number, because 8227821 - 2¹ = 8227819 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 (8227829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195880 + ... + 195921.

It is an arithmetic number, because the mean of its divisors is an integer number (1567208).

Almost surely, 2^8227821 is an apocalyptic number.

It is an amenable number.

8227821 is a deficient number, since it is larger than the sum of its proper divisors (4309843).

8227821 is a wasteful number, since it uses less digits than its factorization.

8227821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391811.

The product of its digits is 3584, while the sum is 30.

The square root of 8227821 is about 2868.4178565892. The cubic root of 8227821 is about 201.8807664805.

The spelling of 8227821 in words is "eight million, two hundred twenty-seven thousand, eight hundred twenty-one".