999813312 has 168 divisors, whose sum is σ = 3015227904. Its totient is φ = 316141056.

The previous prime is 999813277. The next prime is 999813319. The reversal of 999813312 is 213318999.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (999813319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2159193 + ... + 2159655.

Almost surely, 2^999813312 is an apocalyptic number.

999813312 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999813312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1507613952).

999813312 is an abundant number, since it is smaller than the sum of its proper divisors (2015414592).

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

999813312 is a wasteful number, since it uses less digits than its factorization.

999813312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 654 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 999813312 is about 31619.8246674456. The cubic root of 999813312 is about 999.9377667938.

The spelling of 999813312 in words is "nine hundred ninety-nine million, eight hundred thirteen thousand, three hundred twelve".