3939811 has 2 divisors, whose sum is σ = 3939812. Its totient is φ = 3939810.

The previous prime is 3939791. The next prime is 3939829. The reversal of 3939811 is 1189393.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3939811 - 2⁵ = 3939779 is a prime.

It is a super-2 number, since 2×3939811² = 31044221431442, which contains 22 as substring.

3939811 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3939841) 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, 1969905 + 1969906.

It is an arithmetic number, because the mean of its divisors is an integer number (1969906).

Almost surely, 2^3939811 is an apocalyptic number.

3939811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939811 is an equidigital number, since it uses as much as digits as its factorization.

3939811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 3939811 is about 1984.8957151448. The cubic root of 3939811 is about 157.9398772476.

The spelling of 3939811 in words is "three million, nine hundred thirty-nine thousand, eight hundred eleven".