999423737868 has 24 divisors (see below), whose sum is σ = 2338670647600. Its totient is φ = 332186685120.

The previous prime is 999423737867. The next prime is 999423737891. The reversal of 999423737868 is 868737324999.

It is a self number, because there is not a number n which added to its sum of digits gives 999423737868.

It is not an unprimeable number, because it can be changed into a prime (999423737867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119315743 + ... + 119324118.

Almost surely, 2^999423737868 is an apocalyptic number.

It is an amenable number.

999423737868 is an abundant number, since it is smaller than the sum of its proper divisors (1339246909732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999423737868 is a wasteful number, since it uses less digits than its factorization.

999423737868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238640217 (or 238640215 counting only the distinct ones).

The product of its digits is 987614208, while the sum is 75.

The spelling of 999423737868 in words is "nine hundred ninety-nine billion, four hundred twenty-three million, seven hundred thirty-seven thousand, eight hundred sixty-eight".