Multipling 999389016 by its sum of digits (54), we get a square (53967006864 = 2323082).
999389016 divided by its sum of digits (54) gives a square (18507204 = 43022).
It is a congruent number.
It is an unprimeable number.
Almost surely, 2999389016 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 999389016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411080600).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999389016 is an frugal number, since it uses more digits than its factorization.
999389016 is an odious number, because the sum of its binary digits is odd.
The square root of 999389016 is about 31613.1146203597. The cubic root of 999389016 is about 999.7962971746.
The spelling of 999389016 in words is "nine hundred ninety-nine million, three hundred eighty-nine thousand, sixteen".