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BaseRepresentation
bin101011000001001…
…0010010110010101
310201121002100110112
41112002102112111
510424010040041
6355121532405
750525015642
oct12602222625
93647070415
101443440021
11680869941
123434a4105
131a007b02a
14d99bcdc9
1586ac5deb
hex56092595

1443440021 has 8 divisors (see below), whose sum is σ = 1458118200. Its totient is φ = 1428788160.

The previous prime is 1443439999. The next prime is 1443440087. The reversal of 1443440021 is 1200443441.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2402500 + 1441037521 = 1550^2 + 37961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1443440021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1443440221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 114911 + ... + 126851.

It is an arithmetic number, because the mean of its divisors is an integer number (182264775).

Almost surely, 21443440021 is an apocalyptic number.

It is an amenable number.

1443440021 is a deficient number, since it is larger than the sum of its proper divisors (14678179).

1443440021 is a wasteful number, since it uses less digits than its factorization.

1443440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13159.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1443440021 is about 37992.6311407883. The cubic root of 1443440021 is about 1130.1417372527.

Adding to 1443440021 its reverse (1200443441), we get a palindrome (2643883462).

The spelling of 1443440021 in words is "one billion, four hundred forty-three million, four hundred forty thousand, twenty-one".