9981723 has 8 divisors (see below), whose sum is σ = 13345600. Its totient is φ = 6636168.

The previous prime is 9981691. The next prime is 9981731. The reversal of 9981723 is 3271899.

9981723 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9981723 - 2⁵ = 9981691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3253 + ... + 5526.

It is an arithmetic number, because the mean of its divisors is an integer number (1668200).

Almost surely, 2^9981723 is an apocalyptic number.

9981723 is a deficient number, since it is larger than the sum of its proper divisors (3363877).

9981723 is a wasteful number, since it uses less digits than its factorization.

9981723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161.

The product of its digits is 27216, while the sum is 39.

The square root of 9981723 is about 3159.3864910770. The cubic root of 9981723 is about 215.3121336140.

The spelling of 9981723 in words is "nine million, nine hundred eighty-one thousand, seven hundred twenty-three".