999444 has 24 divisors (see below), whose sum is σ = 2396128. Its totient is φ = 324000.

The previous prime is 999437. The next prime is 999451. The reversal of 999444 is 444999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (999437) and next prime (999451).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

999444 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682 + ... + 1569.

2⁹⁹⁹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

999444 is an abundant number, since it is smaller than the sum of its proper divisors (1396684).

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

999444 is a wasteful number, since it uses less digits than its factorization.

999444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2295 (or 2293 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 999444 is about 999.7219613473. The cubic root of 999444 is about 99.9814632308.

It can be divided in two parts, 999 and 444, that multiplied together give a square (443556 = 666²).

The spelling of 999444 in words is "nine hundred ninety-nine thousand, four hundred forty-four".