3856805321 has 4 divisors (see below), whose sum is σ = 3946498512. Its totient is φ = 3767112132.

The previous prime is 3856805311. The next prime is 3856805333. The reversal of 3856805321 is 1235086583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3856805321 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 (3856805311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44846531 + ... + 44846616.

It is an arithmetic number, because the mean of its divisors is an integer number (986624628).

Almost surely, 2^3856805321 is an apocalyptic number.

It is an amenable number.

3856805321 is a deficient number, since it is larger than the sum of its proper divisors (89693191).

3856805321 is an equidigital number, since it uses as much as digits as its factorization.

3856805321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89693190.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 3856805321 is about 62103.1828572417. The cubic root of 3856805321 is about 1568.2281281698.

The spelling of 3856805321 in words is "three billion, eight hundred fifty-six million, eight hundred five thousand, three hundred twenty-one".