8220891 has 16 divisors (see below), whose sum is σ = 12960000. Its totient is φ = 4535328.

The previous prime is 8220887. The next prime is 8220899. The reversal of 8220891 is 1980228.

It is not a de Polignac number, because 8220891 - 2² = 8220887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8220899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6141 + ... + 7358.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^8220891 is an apocalyptic number.

8220891 is a deficient number, since it is larger than the sum of its proper divisors (4739109).

8220891 is a wasteful number, since it uses less digits than its factorization.

8220891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13538.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 8220891 is about 2867.2096191245. The cubic root of 8220891 is about 201.8240715718.

The spelling of 8220891 in words is "eight million, two hundred twenty thousand, eight hundred ninety-one".