190709 has 2 divisors, whose sum is σ = 190710. Its totient is φ = 190708.

The previous prime is 190699. The next prime is 190711. The reversal of 190709 is 907091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103684 + 87025 = 322^2 + 295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190709 is a prime.

It is a Sophie Germain prime.

Together with 190711, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190759) 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, 95354 + 95355.

It is an arithmetic number, because the mean of its divisors is an integer number (95355).

2¹⁹⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

190709 is a deficient number, since it is larger than the sum of its proper divisors (1).

190709 is an equidigital number, since it uses as much as digits as its factorization.

190709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 190709 is about 436.7024158394. The cubic root of 190709 is about 57.5603902382.

The spelling of 190709 in words is "one hundred ninety thousand, seven hundred nine".