999320 has 64 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 330624.

The previous prime is 999307. The next prime is 999329. The reversal of 999320 is 23999.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11999 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2⁹⁹⁹³²⁰ 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 999320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330560).

999320 is an abundant number, since it is smaller than the sum of its proper divisors (1661800).

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

999320 is a wasteful number, since it uses less digits than its factorization.

999320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 999320 is about 999.6599421803. The cubic root of 999320 is about 99.9773281936.

The spelling of 999320 in words is "nine hundred ninety-nine thousand, three hundred twenty".