999312 has 40 divisors (see below), whose sum is σ = 2618880. Its totient is φ = 328320.

The previous prime is 999307. The next prime is 999329. The reversal of 999312 is 213999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5137 + ... + 5327.

It is an arithmetic number, because the mean of its divisors is an integer number (65472).

2⁹⁹⁹³¹² 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 999312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309440).

999312 is an abundant number, since it is smaller than the sum of its proper divisors (1619568).

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

999312 is a wasteful number, since it uses less digits than its factorization.

999312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 305 counting only the distinct ones).

The product of its digits is 4374, while the sum is 33.

The square root of 999312 is about 999.6559408116. The cubic root of 999312 is about 99.9770614053.

The spelling of 999312 in words is "nine hundred ninety-nine thousand, three hundred twelve".