999939136 has 56 divisors (see below), whose sum is σ = 2278115840. Its totient is φ = 426580992.

The previous prime is 999939121. The next prime is 999939137. The reversal of 999939136 is 631939999.

999939136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (999939137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94900 + ... + 104908.

It is an arithmetic number, because the mean of its divisors is an integer number (40680640).

Almost surely, 2^999939136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999939136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139057920).

999939136 is an abundant number, since it is smaller than the sum of its proper divisors (1278176704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999939136 is a wasteful number, since it uses less digits than its factorization.

999939136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10251 (or 10241 counting only the distinct ones).

The product of its digits is 3188646, while the sum is 58.

The square root of 999939136 is about 31621.8142427028. The cubic root of 999939136 is about 999.9797115884.

The spelling of 999939136 in words is "nine hundred ninety-nine million, nine hundred thirty-nine thousand, one hundred thirty-six".