8486721 has 16 divisors (see below), whose sum is σ = 12617920. Its totient is φ = 5637600.

The previous prime is 8486719. The next prime is 8486741. The reversal of 8486721 is 1276848.

8486721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8486721 - 2¹ = 8486719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8486741) 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 15 ways as a sum of consecutive naturals, for example, 13821 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (788620).

Almost surely, 2^8486721 is an apocalyptic number.

It is an amenable number.

8486721 is a deficient number, since it is larger than the sum of its proper divisors (4131199).

8486721 is a wasteful number, since it uses less digits than its factorization.

8486721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1127 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 8486721 is about 2913.1977275839. The cubic root of 8486721 is about 203.9764246112.

It can be divided in two parts, 848 and 6721, that added together give a square (7569 = 87²).

The spelling of 8486721 in words is "eight million, four hundred eighty-six thousand, seven hundred twenty-one".