3981539 has 2 divisors, whose sum is σ = 3981540. Its totient is φ = 3981538.

The previous prime is 3981517. The next prime is 3981541. The reversal of 3981539 is 9351893.

3981539 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3981539 is a prime.

It is a Sophie Germain prime.

Together with 3981541, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (3981569) 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, 1990769 + 1990770.

It is an arithmetic number, because the mean of its divisors is an integer number (1990770).

Almost surely, 2^3981539 is an apocalyptic number.

3981539 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981539 is an equidigital number, since it uses as much as digits as its factorization.

3981539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 3981539 is about 1995.3794125429. The cubic root of 3981539 is about 158.4955201127.

The spelling of 3981539 in words is "three million, nine hundred eighty-one thousand, five hundred thirty-nine".