399444 has 12 divisors (see below), whose sum is σ = 932064. Its totient is φ = 133144.

The previous prime is 399439. The next prime is 399473. The reversal of 399444 is 444993.

399444 = T₃₁₂ + T₃₁₃ + ... + T₃₁₉.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 16632 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (77672).

2³⁹⁹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

399444 is an abundant number, since it is smaller than the sum of its proper divisors (532620).

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

399444 is a wasteful number, since it uses less digits than its factorization.

399444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33294 (or 33292 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 399444 is about 632.0158225867. The cubic root of 399444 is about 73.6464754511.

The spelling of 399444 in words is "three hundred ninety-nine thousand, four hundred forty-four".