999644444 has 12 divisors (see below), whose sum is σ = 1760111304. Its totient is φ = 496755504.

The previous prime is 999644441. The next prime is 999644483. The reversal of 999644444 is 444446999.

999644444 is a modest number, since divided by 44444 gives 9996 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999644441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765947 + ... + 767250.

It is an arithmetic number, because the mean of its divisors is an integer number (146675942).

Almost surely, 2^999644444 is an apocalyptic number.

It is an amenable number.

999644444 is a deficient number, since it is larger than the sum of its proper divisors (760466860).

999644444 is a wasteful number, since it uses less digits than its factorization.

999644444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533364 (or 1533362 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 53.

The square root of 999644444 is about 31617.1542678970. The cubic root of 999644444 is about 999.8814672839.

The spelling of 999644444 in words is "nine hundred ninety-nine million, six hundred forty-four thousand, four hundred forty-four".