3900691 has 2 divisors, whose sum is σ = 3900692. Its totient is φ = 3900690.

The previous prime is 3900679. The next prime is 3900697. The reversal of 3900691 is 1960093.

It is a happy number.

3900691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1960093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3900691 - 2⁷ = 3900563 is a prime.

It is not a weakly prime, because it can be changed into another prime (3900697) 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, 1950345 + 1950346.

It is an arithmetic number, because the mean of its divisors is an integer number (1950346).

Almost surely, 2^3900691 is an apocalyptic number.

3900691 is a deficient number, since it is larger than the sum of its proper divisors (1).

3900691 is an equidigital number, since it uses as much as digits as its factorization.

3900691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 3900691 is about 1975.0167087901. The cubic root of 3900691 is about 157.4153874910.

The spelling of 3900691 in words is "three million, nine hundred thousand, six hundred ninety-one".