9997723 has 4 divisors (see below), whose sum is σ = 10138608. Its totient is φ = 9856840.

The previous prime is 9997711. The next prime is 9997739. The reversal of 9997723 is 3277999.

9997723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9997723 is a prime.

It is a Duffinian number.

9997723 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9997703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70336 + ... + 70477.

It is an arithmetic number, because the mean of its divisors is an integer number (2534652).

Almost surely, 2^9997723 is an apocalyptic number.

9997723 is a deficient number, since it is larger than the sum of its proper divisors (140885).

9997723 is a wasteful number, since it uses less digits than its factorization.

9997723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140884.

The product of its digits is 214326, while the sum is 46.

The square root of 9997723 is about 3161.9176143600. The cubic root of 9997723 is about 215.4271156026.

It can be divided in two parts, 99977 and 23, that added together give a 5-th power (100000 = 10⁵).

The spelling of 9997723 in words is "nine million, nine hundred ninety-seven thousand, seven hundred twenty-three".