3978349 has 2 divisors, whose sum is σ = 3978350. Its totient is φ = 3978348.

The previous prime is 3978329. The next prime is 3978421. The reversal of 3978349 is 9438793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 915849 = 1750^2 + 957^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978349 - 2¹³ = 3970157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3978329) 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, 1989174 + 1989175.

It is an arithmetic number, because the mean of its divisors is an integer number (1989175).

Almost surely, 2^3978349 is an apocalyptic number.

It is an amenable number.

3978349 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978349 is an equidigital number, since it uses as much as digits as its factorization.

3978349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 3978349 is about 1994.5799056443. The cubic root of 3978349 is about 158.4531800529.

The spelling of 3978349 in words is "three million, nine hundred seventy-eight thousand, three hundred forty-nine".