3846639865 has 4 divisors (see below), whose sum is σ = 4615967844. Its totient is φ = 3077311888.

The previous prime is 3846639833. The next prime is 3846639869. The reversal of 3846639865 is 5689366483.

It is a happy number.

3846639865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2564713449 + 1281926416 = 50643^2 + 35804^2 .

It is a cyclic number.

It is not a de Polignac number, because 3846639865 - 2⁵ = 3846639833 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3846639869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384663982 + ... + 384663991.

It is an arithmetic number, because the mean of its divisors is an integer number (1153991961).

Almost surely, 2^3846639865 is an apocalyptic number.

It is an amenable number.

3846639865 is a deficient number, since it is larger than the sum of its proper divisors (769327979).

3846639865 is an equidigital number, since it uses as much as digits as its factorization.

3846639865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769327978.

The product of its digits is 22394880, while the sum is 58.

The square root of 3846639865 is about 62021.2855800329. The cubic root of 3846639865 is about 1566.8491128754.

The spelling of 3846639865 in words is "three billion, eight hundred forty-six million, six hundred thirty-nine thousand, eight hundred sixty-five".