3856439 has 4 divisors (see below), whose sum is σ = 3929256. Its totient is φ = 3783624.

The previous prime is 3856409. The next prime is 3856451. The reversal of 3856439 is 9346583.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3856439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856409) 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, 36329 + ... + 36434.

It is an arithmetic number, because the mean of its divisors is an integer number (982314).

Almost surely, 2^3856439 is an apocalyptic number.

3856439 is a deficient number, since it is larger than the sum of its proper divisors (72817).

3856439 is an equidigital number, since it uses as much as digits as its factorization.

3856439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72816.

The product of its digits is 77760, while the sum is 38.

The square root of 3856439 is about 1963.7818106908. The cubic root of 3856439 is about 156.8178476274.

The spelling of 3856439 in words is "three million, eight hundred fifty-six thousand, four hundred thirty-nine".