3881865 has 32 divisors (see below), whose sum is σ = 7088256. Its totient is φ = 1797120.

The previous prime is 3881863. The next prime is 3881869. The reversal of 3881865 is 5681883.

It is a happy number.

It is not a de Polignac number, because 3881865 - 2¹ = 3881863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3881863) 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 31 ways as a sum of consecutive naturals, for example, 2730 + ... + 3900.

It is an arithmetic number, because the mean of its divisors is an integer number (221508).

Almost surely, 2^3881865 is an apocalyptic number.

It is an amenable number.

3881865 is a deficient number, since it is larger than the sum of its proper divisors (3206391).

3881865 is a wasteful number, since it uses less digits than its factorization.

3881865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209.

The product of its digits is 46080, while the sum is 39.

The square root of 3881865 is about 1970.2449086345. The cubic root of 3881865 is about 157.1617330730.

It can be divided in two parts, 38818 and 65, that added together give a palindrome (38883).

The spelling of 3881865 in words is "three million, eight hundred eighty-one thousand, eight hundred sixty-five".