999939199 has 16 divisors (see below), whose sum is σ = 1154285568. Its totient is φ = 848498112.

The previous prime is 999939137. The next prime is 999939203. The reversal of 999939199 is 991939999.

It is not a de Polignac number, because 999939199 - 2²³ = 991550591 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 (999939799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547602 + ... + 549424.

It is an arithmetic number, because the mean of its divisors is an integer number (72142848).

Almost surely, 2^999939199 is an apocalyptic number.

999939199 is a deficient number, since it is larger than the sum of its proper divisors (154346369).

999939199 is a wasteful number, since it uses less digits than its factorization.

999939199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574.

The product of its digits is 14348907, while the sum is 67.

The square root of 999939199 is about 31621.8152388505. The cubic root of 999939199 is about 999.9797325892.

The spelling of 999939199 in words is "nine hundred ninety-nine million, nine hundred thirty-nine thousand, one hundred ninety-nine".