9966838 has 32 divisors (see below), whose sum is σ = 17860608. Its totient is φ = 4082400.

The previous prime is 9966829. The next prime is 9966857. The reversal of 9966838 is 8386699.

It is a junction number, because it is equal to n+sod(n) for n = 9966791 and 9966800.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 36643 + ... + 36913.

It is an arithmetic number, because the mean of its divisors is an integer number (558144).

Almost surely, 2^9966838 is an apocalyptic number.

9966838 is a deficient number, since it is larger than the sum of its proper divisors (7893770).

9966838 is a wasteful number, since it uses less digits than its factorization.

9966838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388.

The product of its digits is 559872, while the sum is 49.

The square root of 9966838 is about 3157.0299333392. The cubic root of 9966838 is about 215.2050540541.

The spelling of 9966838 in words is "nine million, nine hundred sixty-six thousand, eight hundred thirty-eight".