399539 has 4 divisors (see below), whose sum is σ = 456624. Its totient is φ = 342456.

The previous prime is 399527. The next prime is 399541. The reversal of 399539 is 935993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935993 = 71 ⋅13183.

It is a cyclic number.

It is not a de Polignac number, because 399539 - 2⁴ = 399523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28532 + ... + 28545.

It is an arithmetic number, because the mean of its divisors is an integer number (114156).

2³⁹⁹⁵³⁹ is an apocalyptic number.

399539 is a deficient number, since it is larger than the sum of its proper divisors (57085).

399539 is an equidigital number, since it uses as much as digits as its factorization.

399539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57084.

The product of its digits is 32805, while the sum is 38.

The square root of 399539 is about 632.0909744649. The cubic root of 399539 is about 73.6523134497.

The spelling of 399539 in words is "three hundred ninety-nine thousand, five hundred thirty-nine".