3979889 has 2 divisors, whose sum is σ = 3979890. Its totient is φ = 3979888.

The previous prime is 3979883. The next prime is 3979891. The reversal of 3979889 is 9889793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3312400 + 667489 = 1820^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 3979889 - 2¹⁶ = 3914353 is a prime.

Together with 3979891, it forms a pair of twin primes.

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 3979889.

It is not a weakly prime, because it can be changed into another prime (3979883) 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, 1989944 + 1989945.

It is an arithmetic number, because the mean of its divisors is an integer number (1989945).

Almost surely, 2^3979889 is an apocalyptic number.

It is an amenable number.

3979889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979889 is an equidigital number, since it uses as much as digits as its factorization.

3979889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 3979889 is about 1994.9659144958. The cubic root of 3979889 is about 158.4736229065.

The spelling of 3979889 in words is "three million, nine hundred seventy-nine thousand, eight hundred eighty-nine".