999789312 has 144 divisors (see below), whose sum is σ = 2858738400. Its totient is φ = 309067776.

The previous prime is 999789251. The next prime is 999789313. The reversal of 999789312 is 213987999.

It is not an unprimeable number, because it can be changed into a prime (999789313) 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, 952564 + ... + 953612.

It is an arithmetic number, because the mean of its divisors is an integer number (19852350).

Almost surely, 2^999789312 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 999789312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1429369200).

999789312 is an abundant number, since it is smaller than the sum of its proper divisors (1858949088).

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

999789312 is a wasteful number, since it uses less digits than its factorization.

999789312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1144 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 57.

The square root of 999789312 is about 31619.4451564223. The cubic root of 999789312 is about 999.9297657339.

The spelling of 999789312 in words is "nine hundred ninety-nine million, seven hundred eighty-nine thousand, three hundred twelve".