399579 has 8 divisors (see below), whose sum is σ = 556032. Its totient is φ = 254760.

The previous prime is 399577. The next prime is 399583. The reversal of 399579 is 975993.

It is a happy number.

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

It is not a de Polignac number, because 399579 - 2¹ = 399577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399579.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399571) 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, 2827 + ... + 2964.

It is an arithmetic number, because the mean of its divisors is an integer number (69504).

2³⁹⁹⁵⁷⁹ is an apocalyptic number.

399579 is a deficient number, since it is larger than the sum of its proper divisors (156453).

399579 is a wasteful number, since it uses less digits than its factorization.

399579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817.

The product of its digits is 76545, while the sum is 42.

The square root of 399579 is about 632.1226146880. The cubic root of 399579 is about 73.6547712776.

The spelling of 399579 in words is "three hundred ninety-nine thousand, five hundred seventy-nine".