3979643 has 2 divisors, whose sum is σ = 3979644. Its totient is φ = 3979642.

The previous prime is 3979639. The next prime is 3979663. The reversal of 3979643 is 3469793.

It is a weak prime.

It is an emirp because it is prime and its reverse (3469793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3979643 - 2² = 3979639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3979643.

It is not a weakly prime, because it can be changed into another prime (3979603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989821 + 1989822.

It is an arithmetic number, because the mean of its divisors is an integer number (1989822).

Almost surely, 2^3979643 is an apocalyptic number.

3979643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979643 is an equidigital number, since it uses as much as digits as its factorization.

3979643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 41.

The square root of 3979643 is about 1994.9042583543. The cubic root of 3979643 is about 158.4703577137.

The spelling of 3979643 in words is "three million, nine hundred seventy-nine thousand, six hundred forty-three".