3989849 has 8 divisors (see below), whose sum is σ = 4370760. Its totient is φ = 3625216.

The previous prime is 3989837. The next prime is 3989857. The reversal of 3989849 is 9489893.

It can be written as a sum of positive squares in 4 ways, for example, as 990025 + 2999824 = 995^2 + 1732^2 .

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

It is not a de Polignac number, because 3989849 - 2⁸ = 3989593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3989797 and 3989806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3554 + ... + 4539.

It is an arithmetic number, because the mean of its divisors is an integer number (546345).

Almost surely, 2^3989849 is an apocalyptic number.

It is an amenable number.

3989849 is a deficient number, since it is larger than the sum of its proper divisors (380911).

3989849 is a wasteful number, since it uses less digits than its factorization.

3989849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8139.

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

The square root of 3989849 is about 1997.4606379100. The cubic root of 3989849 is about 158.6057105453.

The spelling of 3989849 in words is "three million, nine hundred eighty-nine thousand, eight hundred forty-nine".