3865681 has 4 divisors (see below), whose sum is σ = 4093092. Its totient is φ = 3638272.

The previous prime is 3865663. The next prime is 3865691. The reversal of 3865681 is 1865683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1865683 = 251 ⋅7433.

It can be written as a sum of positive squares in 2 ways, for example, as 1478656 + 2387025 = 1216^2 + 1545^2 .

It is not a de Polignac number, because 3865681 - 2⁷ = 3865553 is a prime.

It is a super-2 number, since 2×3865681² = 29886979187522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3865681.

It is not an unprimeable number, because it can be changed into a prime (3865601) 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, 113680 + ... + 113713.

It is an arithmetic number, because the mean of its divisors is an integer number (1023273).

Almost surely, 2^3865681 is an apocalyptic number.

It is an amenable number.

3865681 is a deficient number, since it is larger than the sum of its proper divisors (227411).

3865681 is a wasteful number, since it uses less digits than its factorization.

3865681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227410.

The product of its digits is 34560, while the sum is 37.

The square root of 3865681 is about 1966.1335153036. The cubic root of 3865681 is about 156.9430196081.

The spelling of 3865681 in words is "three million, eight hundred sixty-five thousand, six hundred eighty-one".