| Base | Representation |
|---|---|
| bin | 1000000010111110… |
| … | …1101100000000000 |
| 3 | 12120112101220022200 |
| 4 | 2000233231200000 |
| 5 | 13410424201114 |
| 6 | 554200033200 |
| 7 | 104345422140 |
| oct | 20057554000 |
| 9 | 5515356280 |
| 10 | 2159990784 |
| 11 | a09293056 |
| 12 | 503462800 |
| 13 | 285663873 |
| 14 | 166c24920 |
| 15 | c9967409 |
| hex | 80bed800 |
2159990784 has 144 divisors (see below), whose sum is σ = 7130082960. Its totient is φ = 617103360.
The previous prime is 2159990783. The next prime is 2159990821. The reversal of 2159990784 is 4870999512.
It is a tau number, because it is divible by the number of its divisors (144).
It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.
It is a self number, because there is not a number n which added to its sum of digits gives 2159990784.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2159990783) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120654 + ... + 137394.
It is an arithmetic number, because the mean of its divisors is an integer number (49514465).
Almost surely, 22159990784 is an apocalyptic number.
2159990784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2159990784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3565041480).
2159990784 is an abundant number, since it is smaller than the sum of its proper divisors (4970092176).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2159990784 is a wasteful number, since it uses less digits than its factorization.
2159990784 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 16776 (or 16753 counting only the distinct ones).
The product of its (nonzero) digits is 1632960, while the sum is 54.
The square root of 2159990784 is about 46475.7010060096. The cubic root of 2159990784 is about 1292.6589755656.
It can be divided in two parts, 215 and 9990784, that added together give a palindrome (9990999).
The spelling of 2159990784 in words is "two billion, one hundred fifty-nine million, nine hundred ninety thousand, seven hundred eighty-four".
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