3865281 has 16 divisors (see below), whose sum is σ = 5950464. Its totient is φ = 2186064.

The previous prime is 3865247. The next prime is 3865283. The reversal of 3865281 is 1825683.

It is a happy number.

It is not a de Polignac number, because 3865281 - 2⁷ = 3865153 is a prime.

It is a super-2 number, since 2×3865281² = 29880794417922, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3⁷ + 8 + 6⁸ + 5⁷ + 2¹³ + 8⁷ + 1 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865283) 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, 1270 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (371904).

Almost surely, 2^3865281 is an apocalyptic number.

It is an amenable number.

3865281 is a deficient number, since it is larger than the sum of its proper divisors (2085183).

3865281 is a wasteful number, since it uses less digits than its factorization.

3865281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its digits is 11520, while the sum is 33.

The square root of 3865281 is about 1966.0317901804. The cubic root of 3865281 is about 156.9376062132.

The spelling of 3865281 in words is "three million, eight hundred sixty-five thousand, two hundred eighty-one".