999912 has 32 divisors (see below), whose sum is σ = 2544480. Its totient is φ = 327360.

The previous prime is 999907. The next prime is 999917. The reversal of 999912 is 219999.

It is a happy number.

999912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (999907) and next prime (999917).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999912.

It is not an unprimeable number, because it can be changed into a prime (999917) by changing a digit.

999912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123 + ... + 1805.

It is an arithmetic number, because the mean of its divisors is an integer number (79515).

2⁹⁹⁹⁹¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272240).

999912 is an abundant number, since it is smaller than the sum of its proper divisors (1544568).

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

999912 is a wasteful number, since it uses less digits than its factorization.

999912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 749 counting only the distinct ones).

The product of its digits is 13122, while the sum is 39.

The square root of 999912 is about 999.9559990320. The cubic root of 999912 is about 99.9970665806.

It can be divided in two parts, 9999 and 12, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 999912 in words is "nine hundred ninety-nine thousand, nine hundred twelve".