3988643 has 2 divisors, whose sum is σ = 3988644. Its totient is φ = 3988642.

The previous prime is 3988627. The next prime is 3988661. The reversal of 3988643 is 3468893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3988643 - 2⁴ = 3988627 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3988643.

It is not a weakly prime, because it can be changed into another prime (3988343) 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, 1994321 + 1994322.

It is an arithmetic number, because the mean of its divisors is an integer number (1994322).

Almost surely, 2^3988643 is an apocalyptic number.

3988643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988643 is an equidigital number, since it uses as much as digits as its factorization.

3988643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 3988643 is about 1997.1587317988. The cubic root of 3988643 is about 158.5897285067.

The spelling of 3988643 in words is "three million, nine hundred eighty-eight thousand, six hundred forty-three".