999697923 has 32 divisors (see below), whose sum is σ = 1694430720. Its totient is φ = 570641760.

The previous prime is 999697891. The next prime is 999697961. The reversal of 999697923 is 329796999.

999697923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 31618²-1.

It is not a de Polignac number, because 999697923 - 2⁵ = 999697891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (999697723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219061 + ... + 223577.

It is an arithmetic number, because the mean of its divisors is an integer number (52950960).

Almost surely, 2^999697923 is an apocalyptic number.

999697923 is a deficient number, since it is larger than the sum of its proper divisors (694732797).

999697923 is a wasteful number, since it uses less digits than its factorization.

999697923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5704 (or 5698 counting only the distinct ones).

The product of its digits is 14880348, while the sum is 63.

The square root of 999697923 is about 31617.9999841862. Note that the first 4 decimals coincide. The cubic root of 999697923 is about 999.8992975260.

The spelling of 999697923 in words is "nine hundred ninety-nine million, six hundred ninety-seven thousand, nine hundred twenty-three".