3869855 has 16 divisors (see below), whose sum is σ = 5142528. Its totient is φ = 2772000.

The previous prime is 3869849. The next prime is 3869857. The reversal of 3869855 is 5589683.

It is not a de Polignac number, because 3869855 - 2⁶ = 3869791 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3869857) 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, 3410 + ... + 4400.

It is an arithmetic number, because the mean of its divisors is an integer number (321408).

Almost surely, 2^3869855 is an apocalyptic number.

3869855 is a deficient number, since it is larger than the sum of its proper divisors (1272673).

3869855 is a wasteful number, since it uses less digits than its factorization.

3869855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078.

The product of its digits is 259200, while the sum is 44.

The square root of 3869855 is about 1967.1947031242. The cubic root of 3869855 is about 156.9994861168. Note that the first 3 decimals are identical.

The spelling of 3869855 in words is "three million, eight hundred sixty-nine thousand, eight hundred fifty-five".