Base | Representation |
---|---|
bin | 101010111011111… |
… | …1100111001100001 |
3 | 10201101222201000002 |
4 | 1111313330321201 |
5 | 10422311340341 |
6 | 354543505345 |
7 | 50463003053 |
oct | 12567747141 |
9 | 3641881002 |
10 | 1440730721 |
11 | 67a289351 |
12 | 3425b8255 |
13 | 19c63cab1 |
14 | d94b58d3 |
15 | 8673d29b |
hex | 55dfce61 |
1440730721 has 4 divisors (see below), whose sum is σ = 1444253700. Its totient is φ = 1437207744.
The previous prime is 1440730699. The next prime is 1440730723. The reversal of 1440730721 is 1270370441.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 815730721 + 625000000 = 28561^2 + 25000^2 .
It is a cyclic number.
It is not a de Polignac number, because 1440730721 - 26 = 1440730657 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1440730723) by changing a digit.
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 3 ways as a sum of consecutive naturals, for example, 1760876 + ... + 1761693.
It is an arithmetic number, because the mean of its divisors is an integer number (361063425).
Almost surely, 21440730721 is an apocalyptic number.
It is an amenable number.
1440730721 is a deficient number, since it is larger than the sum of its proper divisors (3522979).
1440730721 is an equidigital number, since it uses as much as digits as its factorization.
1440730721 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3522978.
The product of its (nonzero) digits is 4704, while the sum is 29.
The square root of 1440730721 is about 37956.9587954567. The cubic root of 1440730721 is about 1129.4342120207.
The spelling of 1440730721 in words is "one billion, four hundred forty million, seven hundred thirty thousand, seven hundred twenty-one".
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