399544 has 8 divisors (see below), whose sum is σ = 749160. Its totient is φ = 199768.

The previous prime is 399541. The next prime is 399557. The reversal of 399544 is 445993.

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

It is a d-powerful number, because it can be written as 3¹⁰ + 9² + 5⁷ + 9² + 4³ + 4⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24964 + ... + 24979.

It is an arithmetic number, because the mean of its divisors is an integer number (93645).

2³⁹⁹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

399544 is a deficient number, since it is larger than the sum of its proper divisors (349616).

399544 is a wasteful number, since it uses less digits than its factorization.

399544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49949 (or 49945 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 399544 is about 632.0949295794. The cubic root of 399544 is about 73.6526206872.

The spelling of 399544 in words is "three hundred ninety-nine thousand, five hundred forty-four".