8721279 has 12 divisors (see below), whose sum is σ = 14397136. Its totient is φ = 4983552.

The previous prime is 8721269. The next prime is 8721281. The reversal of 8721279 is 9721278.

It is not a de Polignac number, because 8721279 - 2¹³ = 8713087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721239) 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 11 ways as a sum of consecutive naturals, for example, 69154 + ... + 69279.

Almost surely, 2^8721279 is an apocalyptic number.

8721279 is a deficient number, since it is larger than the sum of its proper divisors (5675857).

8721279 is a wasteful number, since it uses less digits than its factorization.

8721279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138446 (or 138443 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 8721279 is about 2953.1811661325. The cubic root of 8721279 is about 205.8385560732.

Subtracting 8721279 from its reverse (9721278), we obtain a palindrome (999999).

The spelling of 8721279 in words is "eight million, seven hundred twenty-one thousand, two hundred seventy-nine".