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12643 = 47269
BaseRepresentation
bin11000101100011
3122100021
43011203
5401033
6134311
751601
oct30543
918307
1012643
119554
127397
1359a7
144871
153b2d
hex3163

12643 has 4 divisors (see below), whose sum is σ = 12960. Its totient is φ = 12328.

The previous prime is 12641. The next prime is 12647. The reversal of 12643 is 34621.

12643 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34621 = 89389.

It is a cyclic number.

It is not a de Polignac number, because 12643 - 21 = 12641 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (12641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 181.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

212643 is an apocalyptic number.

12643 is a deficient number, since it is larger than the sum of its proper divisors (317).

12643 is an equidigital number, since it uses as much as digits as its factorization.

12643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its digits is 144, while the sum is 16.

The square root of 12643 is about 112.4410956901. The cubic root of 12643 is about 23.2961084452.

It can be divided in two parts, 126 and 43, that added together give a square (169 = 132).

The spelling of 12643 in words is "twelve thousand, six hundred forty-three".

Divisors: 1 47 269 12643