3978817 has 2 divisors, whose sum is σ = 3978818. Its totient is φ = 3978816.

The previous prime is 3978811. The next prime is 3978823. The reversal of 3978817 is 7188793.

3978817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (3978811) and next prime (3978823).

It can be written as a sum of positive squares in only one way, i.e., 3825936 + 152881 = 1956^2 + 391^2 .

It is an emirp because it is prime and its reverse (7188793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3978817 is a prime.

It is not a weakly prime, because it can be changed into another prime (3978811) 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, 1989408 + 1989409.

It is an arithmetic number, because the mean of its divisors is an integer number (1989409).

Almost surely, 2^3978817 is an apocalyptic number.

It is an amenable number.

3978817 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978817 is an equidigital number, since it uses as much as digits as its factorization.

3978817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The square root of 3978817 is about 1994.6972201314. The cubic root of 3978817 is about 158.4593931144.

The spelling of 3978817 in words is "three million, nine hundred seventy-eight thousand, eight hundred seventeen".