15723 has 6 divisors (see below), whose sum is σ = 22724. Its totient is φ = 10476.

The previous prime is 15683. The next prime is 15727. The reversal of 15723 is 32751.

It is not a de Polignac number, because 15723 - 2⁸ = 15467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15696 and 15705.

It is not an unprimeable number, because it can be changed into a prime (15727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 865 + ... + 882.

2¹⁵⁷²³ is an apocalyptic number.

15723 is a deficient number, since it is larger than the sum of its proper divisors (7001).

15723 is a wasteful number, since it uses less digits than its factorization.

15723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753 (or 1750 counting only the distinct ones).

The product of its digits is 210, while the sum is 18.

The square root of 15723 is about 125.3913872640. The cubic root of 15723 is about 25.0521577737.

The spelling of 15723 in words is "fifteen thousand, seven hundred twenty-three".