3856809 has 16 divisors (see below), whose sum is σ = 5690304. Its totient is φ = 2304000.

The previous prime is 3856793. The next prime is 3856813. The reversal of 3856809 is 9086583.

It is not a de Polignac number, because 3856809 - 2⁴ = 3856793 is a prime.

3856809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3856109) 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 15 ways as a sum of consecutive naturals, for example, 1609 + ... + 3209.

It is an arithmetic number, because the mean of its divisors is an integer number (355644).

Almost surely, 2^3856809 is an apocalyptic number.

It is an amenable number.

3856809 is a deficient number, since it is larger than the sum of its proper divisors (1833495).

3856809 is a wasteful number, since it uses less digits than its factorization.

3856809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 3856809 is about 1963.8760144164. The cubic root of 3856809 is about 156.8228626813.

The spelling of 3856809 in words is "three million, eight hundred fifty-six thousand, eight hundred nine".