3986641 has 2 divisors, whose sum is σ = 3986642. Its totient is φ = 3986640.

The previous prime is 3986623. The next prime is 3986651. The reversal of 3986641 is 1466893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2822400 + 1164241 = 1680^2 + 1079^2 .

It is an emirp because it is prime and its reverse (1466893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3986641 - 2⁷ = 3986513 is a prime.

3986641 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3986641.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3986611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993320 + 1993321.

It is an arithmetic number, because the mean of its divisors is an integer number (1993321).

Almost surely, 2^3986641 is an apocalyptic number.

It is an amenable number.

3986641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3986641 is an equidigital number, since it uses as much as digits as its factorization.

3986641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 3986641 is about 1996.6574568513. The cubic root of 3986641 is about 158.5631906782.

The spelling of 3986641 in words is "three million, nine hundred eighty-six thousand, six hundred forty-one".