3909691 has 2 divisors, whose sum is σ = 3909692. Its totient is φ = 3909690.

The previous prime is 3909671. The next prime is 3909707. The reversal of 3909691 is 1969093.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3909691 - 2⁹ = 3909179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3909691.

It is not a weakly prime, because it can be changed into another prime (3909641) 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, 1954845 + 1954846.

It is an arithmetic number, because the mean of its divisors is an integer number (1954846).

Almost surely, 2^3909691 is an apocalyptic number.

3909691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909691 is an equidigital number, since it uses as much as digits as its factorization.

3909691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 3909691 is about 1977.2938577763. The cubic root of 3909691 is about 157.5363618070.

The spelling of 3909691 in words is "three million, nine hundred nine thousand, six hundred ninety-one".