99999723 has 4 divisors (see below), whose sum is σ = 133332968. Its totient is φ = 66666480.

The previous prime is 99999721. The next prime is 99999773. The reversal of 99999723 is 32799999.

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

It is not a de Polignac number, because 99999723 - 2¹ = 99999721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999721) 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, 16666618 + ... + 16666623.

It is an arithmetic number, because the mean of its divisors is an integer number (33333242).

Almost surely, 2^99999723 is an apocalyptic number.

99999723 is a deficient number, since it is larger than the sum of its proper divisors (33333245).

99999723 is a wasteful number, since it uses less digits than its factorization.

99999723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333244.

The product of its digits is 2480058, while the sum is 57.

The square root of 99999723 is about 9999.9861499904. The cubic root of 99999723 is about 464.1584547875.

The spelling of 99999723 in words is "ninety-nine million, nine hundred ninety-nine thousand, seven hundred twenty-three".