8539866 has 12 divisors (see below), whose sum is σ = 18503082. Its totient is φ = 2846616.

The previous prime is 8539847. The next prime is 8539889. The reversal of 8539866 is 6689358.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 1490841 = 2655^2 + 1221^2 .

It is a super-2 number, since 2×8539866² = 145858622595912, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 237201 + ... + 237236.

Almost surely, 2^8539866 is an apocalyptic number.

8539866 is an abundant number, since it is smaller than the sum of its proper divisors (9963216).

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

8539866 is a wasteful number, since it uses less digits than its factorization.

8539866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474445 (or 474442 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 8539866 is about 2922.3049122225. The cubic root of 8539866 is about 204.4013149630.

The spelling of 8539866 in words is "eight million, five hundred thirty-nine thousand, eight hundred sixty-six".