9865966 has 16 divisors (see below), whose sum is σ = 16224768. Its totient is φ = 4462200.

The previous prime is 9865949. The next prime is 9865979. The reversal of 9865966 is 6695689.

It is a super-2 number, since 2×9865966² = 194674570226312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3901 + ... + 5911.

It is an arithmetic number, because the mean of its divisors is an integer number (1014048).

Almost surely, 2^9865966 is an apocalyptic number.

9865966 is a deficient number, since it is larger than the sum of its proper divisors (6358802).

9865966 is a wasteful number, since it uses less digits than its factorization.

9865966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247.

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

The square root of 9865966 is about 3141.0135306936. The cubic root of 9865966 is about 214.4765778422.

The spelling of 9865966 in words is "nine million, eight hundred sixty-five thousand, nine hundred sixty-six".