4019909 has 2 divisors, whose sum is σ = 4019910. Its totient is φ = 4019908.

The previous prime is 4019879. The next prime is 4019993. The reversal of 4019909 is 9099104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2464900 + 1555009 = 1570^2 + 1247^2 .

It is a cyclic number.

It is not a de Polignac number, because 4019909 - 2¹⁶ = 3954373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4019009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2009954 + 2009955.

It is an arithmetic number, because the mean of its divisors is an integer number (2009955).

Almost surely, 2^4019909 is an apocalyptic number.

It is an amenable number.

4019909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4019909 is an equidigital number, since it uses as much as digits as its factorization.

4019909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 4019909 is about 2004.9710721105. The cubic root of 4019909 is about 159.0030325226.

The spelling of 4019909 in words is "four million, nineteen thousand, nine hundred nine".