399944 has 8 divisors (see below), whose sum is σ = 749910. Its totient is φ = 199968.

The previous prime is 399941. The next prime is 399953. The reversal of 399944 is 449993.

It can be written as a sum of positive squares in only one way, i.e., 315844 + 84100 = 562^2 + 290^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 399898 and 399907.

It is not an unprimeable number, because it can be changed into a prime (399941) by changing a digit.

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 as a sum of consecutive naturals, namely, 24989 + ... + 25004.

2³⁹⁹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

399944 is a deficient number, since it is larger than the sum of its proper divisors (349966).

399944 is a wasteful number, since it uses less digits than its factorization.

399944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999 (or 49995 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 399944 is about 632.4112585968. The cubic root of 399944 is about 73.6771913829.

The spelling of 399944 in words is "three hundred ninety-nine thousand, nine hundred forty-four".