8721979 has 8 divisors (see below), whose sum is σ = 10047488. Its totient is φ = 7416360.

The previous prime is 8721941. The next prime is 8721989. The reversal of 8721979 is 9791278.

It is a happy number.

8721979 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8721979 - 2⁷ = 8721851 is a prime.

It is a Duffinian 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4017 + ... + 5794.

It is an arithmetic number, because the mean of its divisors is an integer number (1255936).

Almost surely, 2^8721979 is an apocalyptic number.

8721979 is a deficient number, since it is larger than the sum of its proper divisors (1325509).

8721979 is a wasteful number, since it uses less digits than its factorization.

8721979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9945.

The product of its digits is 63504, while the sum is 43.

The square root of 8721979 is about 2953.2996800189. The cubic root of 8721979 is about 205.8440630306.

The spelling of 8721979 in words is "eight million, seven hundred twenty-one thousand, nine hundred seventy-nine".