3949889 has 2 divisors, whose sum is σ = 3949890. Its totient is φ = 3949888.

The previous prime is 3949877. The next prime is 3949903. The reversal of 3949889 is 9889493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3610000 + 339889 = 1900^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949889 - 2²⁰ = 2901313 is a prime.

It is a super-2 number, since 2×3949889² = 31203246224642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3949819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1974944 + 1974945.

It is an arithmetic number, because the mean of its divisors is an integer number (1974945).

Almost surely, 2^3949889 is an apocalyptic number.

It is an amenable number.

3949889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3949889 is an equidigital number, since it uses as much as digits as its factorization.

3949889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 3949889 is about 1987.4327661584. The cubic root of 3949889 is about 158.0744321631.

The spelling of 3949889 in words is "three million, nine hundred forty-nine thousand, eight hundred eighty-nine".