3981889 has 2 divisors, whose sum is σ = 3981890. Its totient is φ = 3981888.

The previous prime is 3981883. The next prime is 3981899. The reversal of 3981889 is 9881893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 795664 = 1785^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 3981889 - 2³ = 3981881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3981881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990944 + 1990945.

It is an arithmetic number, because the mean of its divisors is an integer number (1990945).

Almost surely, 2^3981889 is an apocalyptic number.

It is an amenable number.

3981889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981889 is an equidigital number, since it uses as much as digits as its factorization.

3981889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 3981889 is about 1995.4671132344. The cubic root of 3981889 is about 158.5001641969.

The spelling of 3981889 in words is "three million, nine hundred eighty-one thousand, eight hundred eighty-nine".