9865863 has 12 divisors (see below), whose sum is σ = 16286608. Its totient is φ = 5637600.

The previous prime is 9865841. The next prime is 9865879. The reversal of 9865863 is 3685689.

It is not a de Polignac number, because 9865863 - 2¹⁰ = 9864839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865813) 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, 78238 + ... + 78363.

Almost surely, 2^9865863 is an apocalyptic number.

9865863 is a deficient number, since it is larger than the sum of its proper divisors (6420745).

9865863 is a wasteful number, since it uses less digits than its factorization.

9865863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156614 (or 156611 counting only the distinct ones).

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

The square root of 9865863 is about 3140.9971346692. The cubic root of 9865863 is about 214.4758314661.

The spelling of 9865863 in words is "nine million, eight hundred sixty-five thousand, eight hundred sixty-three".