3847649 has 4 divisors (see below), whose sum is σ = 4143636. Its totient is φ = 3551664.

The previous prime is 3847639. The next prime is 3847651. The reversal of 3847649 is 9467483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9467483 = 1201 ⋅7883.

It can be written as a sum of positive squares in 2 ways, for example, as 2347024 + 1500625 = 1532^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3847649 - 2²⁰ = 2799073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3847619) 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, 147974 + ... + 147999.

It is an arithmetic number, because the mean of its divisors is an integer number (1035909).

Almost surely, 2^3847649 is an apocalyptic number.

It is an amenable number.

3847649 is a deficient number, since it is larger than the sum of its proper divisors (295987).

3847649 is a wasteful number, since it uses less digits than its factorization.

3847649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295986.

The product of its digits is 145152, while the sum is 41.

The square root of 3847649 is about 1961.5425052749. The cubic root of 3847649 is about 156.6986117646.

The spelling of 3847649 in words is "three million, eight hundred forty-seven thousand, six hundred forty-nine".