8872821 has 10 divisors (see below), whose sum is σ = 13254582. Its totient is φ = 5915160.

The previous prime is 8872819. The next prime is 8872837. The reversal of 8872821 is 1282788.

It can be written as a sum of positive squares in only one way, i.e., 5948721 + 2924100 = 2439^2 + 1710^2 .

It is not a de Polignac number, because 8872821 - 2¹ = 8872819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8872891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 54690 + ... + 54851.

Almost surely, 2^8872821 is an apocalyptic number.

8872821 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8872821 is a deficient number, since it is larger than the sum of its proper divisors (4381761).

8872821 is a wasteful number, since it uses less digits than its factorization.

8872821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109553 (or 109544 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 8872821 is about 2978.7280842668. The cubic root of 8872821 is about 207.0239417802.

The spelling of 8872821 in words is "eight million, eight hundred seventy-two thousand, eight hundred twenty-one".