3938791 has 2 divisors, whose sum is σ = 3938792. Its totient is φ = 3938790.

The previous prime is 3938789. The next prime is 3938821. The reversal of 3938791 is 1978393.

It is a weak prime.

It is an emirp because it is prime and its reverse (1978393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3938791 - 2¹ = 3938789 is a prime.

Together with 3938789, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3938731) 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, 1969395 + 1969396.

It is an arithmetic number, because the mean of its divisors is an integer number (1969396).

Almost surely, 2^3938791 is an apocalyptic number.

3938791 is a deficient number, since it is larger than the sum of its proper divisors (1).

3938791 is an equidigital number, since it uses as much as digits as its factorization.

3938791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 3938791 is about 1984.6387580615. The cubic root of 3938791 is about 157.9262460879.

The spelling of 3938791 in words is "three million, nine hundred thirty-eight thousand, seven hundred ninety-one".