117839 has 2 divisors, whose sum is σ = 117840. Its totient is φ = 117838.

The previous prime is 117833. The next prime is 117841. The reversal of 117839 is 938711.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117839 is a prime.

It is a Sophie Germain prime.

Together with 117841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58919 + 58920.

It is an arithmetic number, because the mean of its divisors is an integer number (58920).

2¹¹⁷⁸³⁹ is an apocalyptic number.

117839 is a deficient number, since it is larger than the sum of its proper divisors (1).

117839 is an equidigital number, since it uses as much as digits as its factorization.

117839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 117839 is about 343.2768561963. The cubic root of 117839 is about 49.0263637110.

The spelling of 117839 in words is "one hundred seventeen thousand, eight hundred thirty-nine".