3909509 has 2 divisors, whose sum is σ = 3909510. Its totient is φ = 3909508.

The previous prime is 3909491. The next prime is 3909523. The reversal of 3909509 is 9059093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3161284 + 748225 = 1778^2 + 865^2 .

It is an emirp because it is prime and its reverse (9059093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3909509 - 2⁸ = 3909253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3909559) 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, 1954754 + 1954755.

It is an arithmetic number, because the mean of its divisors is an integer number (1954755).

Almost surely, 2^3909509 is an apocalyptic number.

It is an amenable number.

3909509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909509 is an equidigital number, since it uses as much as digits as its factorization.

3909509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935, while the sum is 35.

The square root of 3909509 is about 1977.2478347440. The cubic root of 3909509 is about 157.5339172776.

The spelling of 3909509 in words is "three million, nine hundred nine thousand, five hundred nine".