9966999 has 8 divisors (see below), whose sum is σ = 15187840. Its totient is φ = 5695416.

The previous prime is 9966997. The next prime is 9967003. The reversal of 9966999 is 9996699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9966999 - 2¹ = 9966997 is a prime.

It is a Duffinian number.

9966999 is a lucky number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966997) 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 7 ways as a sum of consecutive naturals, for example, 237289 + ... + 237330.

It is an arithmetic number, because the mean of its divisors is an integer number (1898480).

Almost surely, 2^9966999 is an apocalyptic number.

9966999 is a deficient number, since it is larger than the sum of its proper divisors (5220841).

9966999 is a wasteful number, since it uses less digits than its factorization.

9966999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474629.

The product of its digits is 2125764, while the sum is 57.

The square root of 9966999 is about 3157.0554318859. The cubic root of 9966999 is about 215.2062128244.

The spelling of 9966999 in words is "nine million, nine hundred sixty-six thousand, nine hundred ninety-nine".