9859666 has 4 divisors (see below), whose sum is σ = 14789502. Its totient is φ = 4929832.

The previous prime is 9859637. The next prime is 9859669. The reversal of 9859666 is 6669589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6669589 = 19 ⋅351031.

It can be written as a sum of positive squares in only one way, i.e., 9740641 + 119025 = 3121^2 + 345^2 .

It is not an unprimeable number, because it can be changed into a prime (9859669) 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 as a sum of consecutive naturals, namely, 2464915 + ... + 2464918.

Almost surely, 2^9859666 is an apocalyptic number.

9859666 is a deficient number, since it is larger than the sum of its proper divisors (4929836).

9859666 is a wasteful number, since it uses less digits than its factorization.

9859666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929835.

The product of its digits is 699840, while the sum is 49.

The square root of 9859666 is about 3140.0105095366. The cubic root of 9859666 is about 214.4309161486.

The spelling of 9859666 in words is "nine million, eight hundred fifty-nine thousand, six hundred sixty-six".