8420686 has 24 divisors (see below), whose sum is σ = 13578840. Its totient is φ = 3915216.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420686 is 6860248.

It is a super-3 number, since 3×8420686³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420681) 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, 77200 + ... + 77308.

It is an arithmetic number, because the mean of its divisors is an integer number (565785).

Almost surely, 2^8420686 is an apocalyptic number.

8420686 is a deficient number, since it is larger than the sum of its proper divisors (5158154).

8420686 is a wasteful number, since it uses less digits than its factorization.

8420686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 8420686 is about 2901.8418289080. The cubic root of 8420686 is about 203.4460010424.

The spelling of 8420686 in words is "eight million, four hundred twenty thousand, six hundred eighty-six".