9781723 has 12 divisors (see below), whose sum is σ = 11511720. Its totient is φ = 8286432.

The previous prime is 9781711. The next prime is 9781747. The reversal of 9781723 is 3271879.

9781723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9781723 - 2¹³ = 9773531 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (9781703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3240 + ... + 5482.

It is an arithmetic number, because the mean of its divisors is an integer number (959310).

Almost surely, 2^9781723 is an apocalyptic number.

9781723 is a deficient number, since it is larger than the sum of its proper divisors (1729997).

9781723 is a wasteful number, since it uses less digits than its factorization.

9781723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346 (or 2339 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 9781723 is about 3127.5746194136. The cubic root of 9781723 is about 213.8643782136.

It can be divided in two parts, 978 and 1723, that added together give a triangular number (2701 = T₇₃).

The spelling of 9781723 in words is "nine million, seven hundred eighty-one thousand, seven hundred twenty-three".