9866842 has 4 divisors (see below), whose sum is σ = 14800266. Its totient is φ = 4933420.

The previous prime is 9866819. The next prime is 9866849. The reversal of 9866842 is 2486689.

It is a happy number.

9866842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9865881 + 961 = 3141^2 + 31^2 .

It is not an unprimeable number, because it can be changed into a prime (9866849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2466709 + ... + 2466712.

Almost surely, 2^9866842 is an apocalyptic number.

9866842 is a deficient number, since it is larger than the sum of its proper divisors (4933424).

9866842 is a wasteful number, since it uses less digits than its factorization.

9866842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933423.

The product of its digits is 165888, while the sum is 43.

The square root of 9866842 is about 3141.1529730339. The cubic root of 9866842 is about 214.4829254525.

The spelling of 9866842 in words is "nine million, eight hundred sixty-six thousand, eight hundred forty-two".