999999723 has 16 divisors (see below), whose sum is σ = 1355758976. Its totient is φ = 655490880.

The previous prime is 999999677. The next prime is 999999733. The reversal of 999999723 is 327999999.

It is not a de Polignac number, because 999999723 - 2¹² = 999995627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110415 + ... + 119127.

It is an arithmetic number, because the mean of its divisors is an integer number (84734936).

Almost surely, 2^999999723 is an apocalyptic number.

999999723 is a deficient number, since it is larger than the sum of its proper divisors (355759253).

999999723 is a wasteful number, since it uses less digits than its factorization.

999999723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9354.

The product of its digits is 22320522, while the sum is 66.

The square root of 999999723 is about 31622.7722219289. The cubic root of 999999723 is about 999.9999076667. Note that the first 4 decimals are identical.

The spelling of 999999723 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred twenty-three".