11939 has 2 divisors, whose sum is σ = 11940.
Its totient is φ = 11938.
The previous prime is 11933. The next prime is 11941. The reversal of 11939 is 93911.
It is a strong prime.
It is an emirp because it is prime and its reverse (93911) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 11939 - 24 = 11923 is a prime.
It is a Sophie Germain prime.
Together with 11941, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 12.
It is not a weakly prime, because it can be changed into another prime (11933) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5969 + 5970.
It is an arithmetic number, because the mean of its divisors is an integer number (5970).
211939 is an apocalyptic number.
11939 is a deficient number, since it is larger than the sum of its proper divisors (1).
11939 is an equidigital number, since it uses as much as digits as its factorization.
11939 is an evil number, because the sum of its binary digits is even.
The product of its digits is 243, while the sum is 23.
The square root of 11939 is about 109.2657311329.
The cubic root of 11939 is about 22.8554258383.
The spelling of 11939 in words is "eleven thousand, nine hundred thirty-nine".