3998689 has 8 divisors (see below), whose sum is σ = 4337928. Its totient is φ = 3671040.

The previous prime is 3998677. The next prime is 3998693. The reversal of 3998689 is 9868993.

3998689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30625 + 3968064 = 175^2 + 1992^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3998689 - 2⁹ = 3998177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172 + ... + 3565.

It is an arithmetic number, because the mean of its divisors is an integer number (542241).

Almost surely, 2^3998689 is an apocalyptic number.

It is an amenable number.

3998689 is a deficient number, since it is larger than the sum of its proper divisors (339239).

3998689 is a wasteful number, since it uses less digits than its factorization.

3998689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795.

The product of its digits is 839808, while the sum is 52.

The square root of 3998689 is about 1999.6722231406. The cubic root of 3998689 is about 158.7227609453.

The spelling of 3998689 in words is "three million, nine hundred ninety-eight thousand, six hundred eighty-nine".