8821000 has 32 divisors (see below), whose sum is σ = 20643480. Its totient is φ = 3528000.

The previous prime is 8820971. The next prime is 8821003. The reversal of 8821000 is 1288.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3147076 + 5673924 = 1774^2 + 2382^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (8821003) 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, 3411 + ... + 5410.

Almost surely, 2^8821000 is an apocalyptic number.

It is an amenable number.

8821000 is an abundant number, since it is smaller than the sum of its proper divisors (11822480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8821000 is a wasteful number, since it uses less digits than its factorization.

8821000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8842 (or 8828 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 8821000 is about 2970.0168349691. The cubic root of 8821000 is about 206.6201190116.

Adding to 8821000 its reverse (1288), we get a palindrome (8822288).

The spelling of 8821000 in words is "eight million, eight hundred twenty-one thousand".