8719821 has 12 divisors (see below), whose sum is σ = 13740480. Its totient is φ = 5284680.

The previous prime is 8719819. The next prime is 8719831. The reversal of 8719821 is 1289178.

It is not a de Polignac number, because 8719821 - 2¹ = 8719819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8719801) 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 11 ways as a sum of consecutive naturals, for example, 43941 + ... + 44138.

It is an arithmetic number, because the mean of its divisors is an integer number (1145040).

Almost surely, 2^8719821 is an apocalyptic number.

It is an amenable number.

8719821 is a deficient number, since it is larger than the sum of its proper divisors (5020659).

8719821 is a wasteful number, since it uses less digits than its factorization.

8719821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88096 (or 88093 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 8719821 is about 2952.9343033667. The cubic root of 8719821 is about 205.8270849216.

The spelling of 8719821 in words is "eight million, seven hundred nineteen thousand, eight hundred twenty-one".