999399999 has 8 divisors (see below), whose sum is σ = 1435035952. Its totient is φ = 615015360.

The previous prime is 999399971. The next prime is 999400013. The reversal of 999399999 is 999993999.

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

It is not a de Polignac number, because 999399999 - 2¹¹ = 999397951 is a prime.

It is a Duffinian number.

999399999 is a modest number, since divided by 99999 gives 9993 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 999399999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999399199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12812782 + ... + 12812859.

It is an arithmetic number, because the mean of its divisors is an integer number (179379494).

Almost surely, 2^999399999 is an apocalyptic number.

999399999 is a deficient number, since it is larger than the sum of its proper divisors (435635953).

999399999 is a wasteful number, since it uses less digits than its factorization.

999399999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25625657.

The product of its digits is 129140163, while the sum is 75.

The square root of 999399999 is about 31613.2883294351. The cubic root of 999399999 is about 999.7999596532.

The spelling of 999399999 in words is "nine hundred ninety-nine million, three hundred ninety-nine thousand, nine hundred ninety-nine".