It is a tau number, because it is divible by the number of its divisors (64).
It is a congruent number.
It is an unprimeable number.
Almost surely, 21945985920 is an apocalyptic number.
1945985920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1945985920 is a wasteful number, since it uses less digits than its factorization.
1945985920 is an odious number, because the sum of its binary digits is odd.
The square root of 1945985920 is about 44113.3304115661. The cubic root of 1945985920 is about 1248.4751368570.
The spelling of 1945985920 in words is "one billion, nine hundred forty-five million, nine hundred eighty-five thousand, nine hundred twenty".