3942581 has 2 divisors, whose sum is σ = 3942582. Its totient is φ = 3942580.

The previous prime is 3942577. The next prime is 3942619. The reversal of 3942581 is 1852493.

3942581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2402500 + 1540081 = 1550^2 + 1241^2 .

It is an emirp because it is prime and its reverse (1852493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3942581 - 2² = 3942577 is a prime.

It is a super-2 number, since 2×3942581² = 31087889883122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3942551) 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, 1971290 + 1971291.

It is an arithmetic number, because the mean of its divisors is an integer number (1971291).

Almost surely, 2^3942581 is an apocalyptic number.

It is an amenable number.

3942581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3942581 is an equidigital number, since it uses as much as digits as its factorization.

3942581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 3942581 is about 1985.5933621968. The cubic root of 3942581 is about 157.9768833349.

The spelling of 3942581 in words is "three million, nine hundred forty-two thousand, five hundred eighty-one".