999980988 has 24 divisors (see below), whose sum is σ = 2342592000. Its totient is φ = 331998000.

The previous prime is 999980923. The next prime is 999981011. The reversal of 999980988 is 889089999.

It is a super-2 number, since 2×999980988² = 1999923952722912288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162988 + ... + 169011.

It is an arithmetic number, because the mean of its divisors is an integer number (97608000).

Almost surely, 2^999980988 is an apocalyptic number.

It is an amenable number.

999980988 is an abundant number, since it is smaller than the sum of its proper divisors (1342611012).

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

999980988 is a wasteful number, since it uses less digits than its factorization.

999980988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332257 (or 332255 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 69.

The square root of 999980988 is about 31622.4759941406. The cubic root of 999980988 is about 999.9936626265.

The spelling of 999980988 in words is "nine hundred ninety-nine million, nine hundred eighty thousand, nine hundred eighty-eight".