3942509 has 2 divisors, whose sum is σ = 3942510. Its totient is φ = 3942508.

The previous prime is 3942503. The next prime is 3942527. The reversal of 3942509 is 9052493.

3942509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2449225 + 1493284 = 1565^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 3942509 - 2⁴ = 3942493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3942503) 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, 1971254 + 1971255.

It is an arithmetic number, because the mean of its divisors is an integer number (1971255).

Almost surely, 2^3942509 is an apocalyptic number.

It is an amenable number.

3942509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3942509 is an equidigital number, since it uses as much as digits as its factorization.

3942509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 3942509 is about 1985.5752315135. The cubic root of 3942509 is about 157.9759216633.

The spelling of 3942509 in words is "three million, nine hundred forty-two thousand, five hundred nine".