3920509 has 2 divisors, whose sum is σ = 3920510. Its totient is φ = 3920508.

The previous prime is 3920471. The next prime is 3920513. The reversal of 3920509 is 9050293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2732409 + 1188100 = 1653^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 3920509 - 2²¹ = 1823357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3920209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960254 + 1960255.

It is an arithmetic number, because the mean of its divisors is an integer number (1960255).

Almost surely, 2^3920509 is an apocalyptic number.

It is an amenable number.

3920509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3920509 is an equidigital number, since it uses as much as digits as its factorization.

3920509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 3920509 is about 1980.0275250612. The cubic root of 3920509 is about 157.6815274926.

The spelling of 3920509 in words is "three million, nine hundred twenty thousand, five hundred nine".