399556 has 24 divisors (see below), whose sum is σ = 753984. Its totient is φ = 184800.

The previous prime is 399541. The next prime is 399557. The reversal of 399556 is 655993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399557) 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 in 7 ways as a sum of consecutive naturals, for example, 3906 + ... + 4006.

It is an arithmetic number, because the mean of its divisors is an integer number (31416).

2³⁹⁹⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

399556 is a deficient number, since it is larger than the sum of its proper divisors (354428).

399556 is a wasteful number, since it uses less digits than its factorization.

399556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 169 counting only the distinct ones).

The product of its digits is 36450, while the sum is 37.

The square root of 399556 is about 632.1044217532. The cubic root of 399556 is about 73.6533580466.

The spelling of 399556 in words is "three hundred ninety-nine thousand, five hundred fifty-six".