999323556 has 96 divisors (see below), whose sum is σ = 2912716800. Its totient is φ = 259065600.

The previous prime is 999323543. The next prime is 999323561. The reversal of 999323556 is 655323999.

It is a junction number, because it is equal to n+sod(n) for n = 999323499 and 999323508.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 952120 + ... + 953168.

It is an arithmetic number, because the mean of its divisors is an integer number (30340800).

Almost surely, 2^999323556 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 999323556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456358400).

999323556 is an abundant number, since it is smaller than the sum of its proper divisors (1913393244).

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

999323556 is a wasteful number, since it uses less digits than its factorization.

999323556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105 (or 2103 counting only the distinct ones).

The product of its digits is 1968300, while the sum is 51.

The square root of 999323556 is about 31612.0792735941. The cubic root of 999323556 is about 999.7744678057.

The spelling of 999323556 in words is "nine hundred ninety-nine million, three hundred twenty-three thousand, five hundred fifty-six".