399839 has 8 divisors (see below), whose sum is σ = 440832. Its totient is φ = 359640.

The previous prime is 399793. The next prime is 399851. The reversal of 399839 is 938993.

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 399839 - 2⁸ = 399583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399796 and 399805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399899) 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, 1682 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (55104).

2³⁹⁹⁸³⁹ is an apocalyptic number.

399839 is a deficient number, since it is larger than the sum of its proper divisors (40993).

399839 is a wasteful number, since it uses less digits than its factorization.

399839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397.

The product of its digits is 52488, while the sum is 41.

The square root of 399839 is about 632.3282375476. The cubic root of 399839 is about 73.6707431617.

The spelling of 399839 in words is "three hundred ninety-nine thousand, eight hundred thirty-nine".