390839 has 4 divisors (see below), whose sum is σ = 407856. Its totient is φ = 373824.

The previous prime is 390829. The next prime is 390851. The reversal of 390839 is 938093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938093 = 13 ⋅72161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390809) 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, 8474 + ... + 8519.

It is an arithmetic number, because the mean of its divisors is an integer number (101964).

2³⁹⁰⁸³⁹ is an apocalyptic number.

390839 is a deficient number, since it is larger than the sum of its proper divisors (17017).

390839 is a wasteful number, since it uses less digits than its factorization.

390839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17016.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 390839 is about 625.1711765589. The cubic root of 390839 is about 73.1137901340.

The spelling of 390839 in words is "three hundred ninety thousand, eight hundred thirty-nine".