3948781 has 2 divisors, whose sum is σ = 3948782. Its totient is φ = 3948780.

The previous prime is 3948731. The next prime is 3948803. The reversal of 3948781 is 1878493.

3948781 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 can be written as a sum of positive squares in only one way, i.e., 3363556 + 585225 = 1834^2 + 765^2 .

It is an emirp because it is prime and its reverse (1878493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3948781 - 2⁷ = 3948653 is a prime.

It is a super-2 number, since 2×3948781² = 31185742771922, which contains 22 as substring.

It is a Chen prime.

3948781 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3948701) 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, 1974390 + 1974391.

It is an arithmetic number, because the mean of its divisors is an integer number (1974391).

Almost surely, 2^3948781 is an apocalyptic number.

It is an amenable number.

3948781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3948781 is an equidigital number, since it uses as much as digits as its factorization.

3948781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 3948781 is about 1987.1539950391. The cubic root of 3948781 is about 158.0596500726.

The spelling of 3948781 in words is "three million, nine hundred forty-eight thousand, seven hundred eighty-one".