3989641 has 2 divisors, whose sum is σ = 3989642. Its totient is φ = 3989640.

The previous prime is 3989593. The next prime is 3989651. The reversal of 3989641 is 1469893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3984016 + 5625 = 1996^2 + 75^2 .

It is an emirp because it is prime and its reverse (1469893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3989641 - 2¹¹ = 3987593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3989594 and 3989603.

It is not a weakly prime, because it can be changed into another prime (3989651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994820 + 1994821.

It is an arithmetic number, because the mean of its divisors is an integer number (1994821).

Almost surely, 2^3989641 is an apocalyptic number.

It is an amenable number.

3989641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989641 is an equidigital number, since it uses as much as digits as its factorization.

3989641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 3989641 is about 1997.4085711241. The cubic root of 3989641 is about 158.6029543373.

The spelling of 3989641 in words is "three million, nine hundred eighty-nine thousand, six hundred forty-one".