999949999 has 4 divisors (see below), whose sum is σ = 1000013320. Its totient is φ = 999886680.

The previous prime is 999949997. The next prime is 999950033.

999949999 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 999949999 - 2¹ = 999949997 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 (999949997) 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 3 ways as a sum of consecutive naturals, for example, 13504 + ... + 46714.

It is an arithmetic number, because the mean of its divisors is an integer number (250003330).

Almost surely, 2^999949999 is an apocalyptic number.

999949999 is a deficient number, since it is larger than the sum of its proper divisors (63321).

999949999 is a wasteful number, since it uses less digits than its factorization.

999949999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63320.

The product of its digits is 172186884, while the sum is 76.

The square root of 999949999 is about 31621.9860065746. The cubic root of 999949999 is about 999.9833327222.

The spelling of 999949999 in words is "nine hundred ninety-nine million, nine hundred forty-nine thousand, nine hundred ninety-nine".