Base | Representation |
---|---|
bin | 10010100100101111… |
… | …101001000010000000 |
3 | 1220110220211002202100 |
4 | 102210233221002000 |
5 | 311321104241230 |
6 | 13055001150400 |
7 | 1304140454004 |
oct | 224457510200 |
9 | 56426732670 |
10 | 19943821440 |
11 | 8504849264 |
12 | 3a4718b400 |
13 | 1b5ab6819a |
14 | d72a60704 |
15 | 7bad70660 |
hex | 4a4be9080 |
19943821440 has 96 divisors (see below), whose sum is σ = 68868528300. Its totient is φ = 5318350848.
The previous prime is 19943821411. The next prime is 19943821453. The reversal of 19943821440 is 4412834991.
19943821440 is a `hidden beast` number, since 1 + 99 + 43 + 82 + 1 + 440 = 666.
It can be written as a sum of positive squares in 2 ways, for example, as 19557463104 + 386358336 = 139848^2 + 19656^2 .
It is a tau number, because it is divible by the number of its divisors (96).
It is a Harshad number since it is a multiple of its sum of digits (45).
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1725475 + ... + 1736994.
Almost surely, 219943821440 is an apocalyptic number.
19943821440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
19943821440 is an abundant number, since it is smaller than the sum of its proper divisors (48924706860).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19943821440 is a wasteful number, since it uses less digits than its factorization.
19943821440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3462494 (or 3462479 counting only the distinct ones).
The product of its (nonzero) digits is 248832, while the sum is 45.
The spelling of 19943821440 in words is "nineteen billion, nine hundred forty-three million, eight hundred twenty-one thousand, four hundred forty".
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