3856638 has 16 divisors (see below), whose sum is σ = 7785360. Its totient is φ = 1273536.

The previous prime is 3856631. The next prime is 3856661. The reversal of 3856638 is 8366583.

It is a junction number, because it is equal to n+sod(n) for n = 3856596 and 3856605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2295 + ... + 3602.

It is an arithmetic number, because the mean of its divisors is an integer number (486585).

Almost surely, 2^3856638 is an apocalyptic number.

3856638 is an abundant number, since it is smaller than the sum of its proper divisors (3928722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3856638 is a wasteful number, since it uses less digits than its factorization.

3856638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6011.

The product of its digits is 103680, while the sum is 39.

The square root of 3856638 is about 1963.8324775805. The cubic root of 3856638 is about 156.8205449530.

The spelling of 3856638 in words is "three million, eight hundred fifty-six thousand, six hundred thirty-eight".