999961988 has 12 divisors (see below), whose sum is σ = 1753416000. Its totient is φ = 498985992.

The previous prime is 999961979. The next prime is 999962057. The reversal of 999961988 is 889169999.

999961988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246488 + ... + 250511.

It is an arithmetic number, because the mean of its divisors is an integer number (146118000).

Almost surely, 2^999961988 is an apocalyptic number.

It is an amenable number.

999961988 is a deficient number, since it is larger than the sum of its proper divisors (753454012).

999961988 is a wasteful number, since it uses less digits than its factorization.

999961988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497506 (or 497504 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 68.

The square root of 999961988 is about 31622.1755734801. The cubic root of 999961988 is about 999.9873291728.

The spelling of 999961988 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred eighty-eight".