399524 has 6 divisors (see below), whose sum is σ = 699174. Its totient is φ = 199760.

The previous prime is 399523. The next prime is 399527. The reversal of 399524 is 425993.

It can be written as a sum of positive squares in only one way, i.e., 399424 + 100 = 632^2 + 10^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399523) 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, 49937 + ... + 49944.

It is an arithmetic number, because the mean of its divisors is an integer number (116529).

2³⁹⁹⁵²⁴ is an apocalyptic number.

It is an amenable number.

399524 is a deficient number, since it is larger than the sum of its proper divisors (299650).

399524 is a wasteful number, since it uses less digits than its factorization.

399524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99885 (or 99883 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 399524 is about 632.0791089729. The cubic root of 399524 is about 73.6513917220.

The spelling of 399524 in words is "three hundred ninety-nine thousand, five hundred twenty-four".