999931323612 has 192 divisors, whose sum is σ = 2558223360000. Its totient is φ = 302154209280.

The previous prime is 999931323607. The next prime is 999931323613. The reversal of 999931323612 is 216323139999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999931323613) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1620633928 + ... + 1620634544.

It is an arithmetic number, because the mean of its divisors is an integer number (13324080000).

Almost surely, 2^999931323612 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 999931323612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1279111680000).

999931323612 is an abundant number, since it is smaller than the sum of its proper divisors (1558292036388).

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

999931323612 is a wasteful number, since it uses less digits than its factorization.

999931323612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436 (or 1434 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 57.

The spelling of 999931323612 in words is "nine hundred ninety-nine billion, nine hundred thirty-one million, three hundred twenty-three thousand, six hundred twelve".