8721924 has 48 divisors (see below), whose sum is σ = 21409920. Its totient is φ = 2759680.

The previous prime is 8721917. The next prime is 8721929. The reversal of 8721924 is 4291278.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (8721929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24532 + ... + 24884.

It is an arithmetic number, because the mean of its divisors is an integer number (446040).

Almost surely, 2^8721924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8721924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10704960).

8721924 is an abundant number, since it is smaller than the sum of its proper divisors (12687996).

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

8721924 is a wasteful number, since it uses less digits than its factorization.

8721924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 458 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 8721924 is about 2953.2903683857. The cubic root of 8721924 is about 205.8436303517.

The spelling of 8721924 in words is "eight million, seven hundred twenty-one thousand, nine hundred twenty-four".