999989220 has 24 divisors (see below), whose sum is σ = 2799969984. Its totient is φ = 266663776.

The previous prime is 999989219. The next prime is 999989231. The reversal of 999989220 is 22989999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8333184 + ... + 8333303.

It is an arithmetic number, because the mean of its divisors is an integer number (116665416).

Almost surely, 2^999989220 is an apocalyptic number.

It is an amenable number.

999989220 is an abundant number, since it is smaller than the sum of its proper divisors (1799980764).

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

999989220 is a wasteful number, since it uses less digits than its factorization.

999989220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16666499 (or 16666497 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 999989220 is about 31622.6061544586. The cubic root of 999989220 is about 999.9964066538.

The spelling of 999989220 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, two hundred twenty".