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643443 = 3214481
BaseRepresentation
bin10011101000101110011
31012200122020
42131011303
5131042233
621442523
75316633
oct2350563
91180566
10643443
113aa479
12270443
13196b48
1412a6c3
15ca9b3
hex9d173

643443 has 4 divisors (see below), whose sum is σ = 857928. Its totient is φ = 428960.

The previous prime is 643439. The next prime is 643453. The reversal of 643443 is 344346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643443 - 22 = 643439 is a prime.

It is a D-number.

643443 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (643403) 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 3 ways as a sum of consecutive naturals, for example, 107238 + ... + 107243.

It is an arithmetic number, because the mean of its divisors is an integer number (214482).

2643443 is an apocalyptic number.

643443 is a deficient number, since it is larger than the sum of its proper divisors (214485).

643443 is a wasteful number, since it uses less digits than its factorization.

643443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214484.

The product of its digits is 3456, while the sum is 24.

The square root of 643443 is about 802.1489886549. The cubic root of 643443 is about 86.3316471134.

Adding to 643443 its reverse (344346), we get a palindrome (987789).

The spelling of 643443 in words is "six hundred forty-three thousand, four hundred forty-three".

Divisors: 1 3 214481 643443