1723 has 2 divisors, whose sum is σ = 1724. Its totient is φ = 1722.

The previous prime is 1721. The next prime is 1733. The reversal of 1723 is 3271.

Subtracting from 1723 its product of digits (42), we obtain a square (1681 = 41^{2}).

Adding to 1723 its reverse (3271), we get a palindrome (4994).

It is a weak prime.

It is an emirp because it is prime and its reverse (3271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1723 - 2^{1} = 1721 is a prime.

Together with 1721, it forms a pair of twin primes.

It is the 42-nd Hogben number.

1723 is a lucky number.

It is a plaindrome in base 15 and base 16.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (1721) by changing a digit.

It is a nontrivial repunit in base 41.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861 + 862.

It is an arithmetic number, because the mean of its divisors is an integer number (862).

2^{1723} is an apocalyptic number.

1723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1723 is an equidigital number, since it uses as much as digits as its factorization.

1723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42, while the sum is 13.

The square root of 1723 is about 41.5090351610. The cubic root of 1723 is about 11.9884147447.

The spelling of 1723 in words is "one thousand, seven hundred twenty-three", and thus it is an iban number.

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