999989792 has 12 divisors (see below), whose sum is σ = 1968729966. Its totient is φ = 499994880.

The previous prime is 999989777. The next prime is 999989797. The reversal of 999989792 is 297989999.

It can be written as a sum of positive squares in only one way, i.e., 983700496 + 16289296 = 31364^2 + 4036^2 .

It is not an unprimeable number, because it can be changed into a prime (999989797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15624809 + ... + 15624872.

Almost surely, 2^999989792 is an apocalyptic number.

It is an amenable number.

999989792 is a deficient number, since it is larger than the sum of its proper divisors (968740174).

999989792 is a wasteful number, since it uses less digits than its factorization.

999989792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31249691 (or 31249683 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 71.

The square root of 999989792 is about 31622.6151986201. The cubic root of 999989792 is about 999.9965973218.

The spelling of 999989792 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, seven hundred ninety-two".