3989687 has 4 divisors (see below), whose sum is σ = 4296600. Its totient is φ = 3682776.

The previous prime is 3989683. The next prime is 3989701. The reversal of 3989687 is 7869893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7869893 = 223 ⋅35291.

It is a cyclic number.

It is not a de Polignac number, because 3989687 - 2² = 3989683 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989683) 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 in 3 ways as a sum of consecutive naturals, for example, 153437 + ... + 153462.

It is an arithmetic number, because the mean of its divisors is an integer number (1074150).

Almost surely, 2^3989687 is an apocalyptic number.

3989687 is a deficient number, since it is larger than the sum of its proper divisors (306913).

3989687 is a wasteful number, since it uses less digits than its factorization.

3989687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306912.

The product of its digits is 653184, while the sum is 50.

The square root of 3989687 is about 1997.4200860110. The cubic root of 3989687 is about 158.6035638916.

The spelling of 3989687 in words is "three million, nine hundred eighty-nine thousand, six hundred eighty-seven".