939839 has 2 divisors, whose sum is σ = 939840. Its totient is φ = 939838.

The previous prime is 939823. The next prime is 939847. The reversal of 939839 is 938939.

It is a strong prime.

It is an emirp because it is prime and its reverse (938939) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 939839 - 2⁴ = 939823 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 939796 and 939805.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 939839.

It is not a weakly prime, because it can be changed into another prime (939439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469919 + 469920.

It is an arithmetic number, because the mean of its divisors is an integer number (469920).

2⁹³⁹⁸³⁹ is an apocalyptic number.

939839 is a deficient number, since it is larger than the sum of its proper divisors (1).

939839 is an equidigital number, since it uses as much as digits as its factorization.

939839 is an evil number, because the sum of its binary digits is even.

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

The square root of 939839 is about 969.4529385174. The cubic root of 939839 is about 97.9530178798.

Subtracting from 939839 its reverse (938939), we obtain a square (900 = 30²).

The spelling of 939839 in words is "nine hundred thirty-nine thousand, eight hundred thirty-nine".