399559 has 4 divisors (see below), whose sum is σ = 412480. Its totient is φ = 386640.

The previous prime is 399557. The next prime is 399571. The reversal of 399559 is 955993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399559 - 2¹ = 399557 is a prime.

It is a Duffinian number.

399559 is a lucky number.

It is a zygodrome in base 2.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6414 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (103120).

2³⁹⁹⁵⁵⁹ is an apocalyptic number.

399559 is a deficient number, since it is larger than the sum of its proper divisors (12921).

399559 is a wasteful number, since it uses less digits than its factorization.

399559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12920.

The product of its digits is 54675, while the sum is 40.

The square root of 399559 is about 632.1067947744. The cubic root of 399559 is about 73.6535423842.

The spelling of 399559 in words is "three hundred ninety-nine thousand, five hundred fifty-nine".