193939 has 2 divisors, whose sum is σ = 193940. Its totient is φ = 193938.

The previous prime is 193937. The next prime is 193943. The reversal of 193939 is 939391.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (939391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 193939 - 2¹ = 193937 is a prime.

It is a super-2 number, since 2×193939² = 75224671442, which contains 22 as substring.

Together with 193937, it forms a pair of twin primes.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (193937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96969 + 96970.

It is an arithmetic number, because the mean of its divisors is an integer number (96970).

2¹⁹³⁹³⁹ is an apocalyptic number.

193939 is a deficient number, since it is larger than the sum of its proper divisors (1).

193939 is an equidigital number, since it uses as much as digits as its factorization.

193939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6561, while the sum is 34.

The square root of 193939 is about 440.3850587838. The cubic root of 193939 is about 57.8835356175.

The spelling of 193939 in words is "one hundred ninety-three thousand, nine hundred thirty-nine".