399508 has 6 divisors (see below), whose sum is σ = 699146. Its totient is φ = 199752.

The previous prime is 399499. The next prime is 399523. The reversal of 399508 is 805993.

It can be written as a sum of positive squares in only one way, i.e., 374544 + 24964 = 612^2 + 158^2 .

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 as a sum of consecutive naturals, namely, 49935 + ... + 49942.

2³⁹⁹⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

399508 is a deficient number, since it is larger than the sum of its proper divisors (299638).

399508 is a wasteful number, since it uses less digits than its factorization.

399508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99881 (or 99879 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 399508 is about 632.0664522026. The cubic root of 399508 is about 73.6504085203.

It can be divided in two parts, 39950 and 8, that multiplied together give a triangular number (319600 = T₇₉₉).

The spelling of 399508 in words is "three hundred ninety-nine thousand, five hundred eight".