999344321 has 12 divisors (see below), whose sum is σ = 1039712700. Its totient is φ = 960485568.

The previous prime is 999344299. The next prime is 999344393. The reversal of 999344321 is 123443999.

It can be written as a sum of positive squares in 6 ways, for example, as 180526096 + 818818225 = 13436^2 + 28615^2 .

It is not a de Polignac number, because 999344321 - 2¹⁴ = 999327937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999344921) 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 11 ways as a sum of consecutive naturals, for example, 189995 + ... + 195183.

It is an arithmetic number, because the mean of its divisors is an integer number (86642725).

Almost surely, 2^999344321 is an apocalyptic number.

It is an amenable number.

999344321 is a deficient number, since it is larger than the sum of its proper divisors (40368379).

999344321 is a wasteful number, since it uses less digits than its factorization.

999344321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5476 (or 5447 counting only the distinct ones).

The product of its digits is 209952, while the sum is 44.

The square root of 999344321 is about 31612.4077064687. The cubic root of 999344321 is about 999.7813925476.

The spelling of 999344321 in words is "nine hundred ninety-nine million, three hundred forty-four thousand, three hundred twenty-one".