399529 has 8 divisors (see below), whose sum is σ = 437192. Its totient is φ = 362880.

The previous prime is 399527. The next prime is 399541. The reversal of 399529 is 925993.

It can be written as a sum of positive squares in 4 ways, for example, as 6400 + 393129 = 80^2 + 627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399529 - 2¹ = 399527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (54649).

2³⁹⁹⁵²⁹ is an apocalyptic number.

It is an amenable number.

399529 is a deficient number, since it is larger than the sum of its proper divisors (37663).

399529 is a wasteful number, since it uses less digits than its factorization.

399529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507.

The product of its digits is 21870, while the sum is 37.

The square root of 399529 is about 632.0830641617. The cubic root of 399529 is about 73.6516989672.

The spelling of 399529 in words is "three hundred ninety-nine thousand, five hundred twenty-nine".