3939641 has 2 divisors, whose sum is σ = 3939642. Its totient is φ = 3939640.

The previous prime is 3939619. The next prime is 3939671. The reversal of 3939641 is 1469393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3225616 + 714025 = 1796^2 + 845^2 .

It is an emirp because it is prime and its reverse (1469393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3939641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3939671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969820 + 1969821.

It is an arithmetic number, because the mean of its divisors is an integer number (1969821).

Almost surely, 2^3939641 is an apocalyptic number.

It is an amenable number.

3939641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939641 is an equidigital number, since it uses as much as digits as its factorization.

3939641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 35.

The square root of 3939641 is about 1984.8528912743. The cubic root of 3939641 is about 157.9376055510.

The spelling of 3939641 in words is "three million, nine hundred thirty-nine thousand, six hundred forty-one".