3865181 has 8 divisors (see below), whose sum is σ = 3949560. Its totient is φ = 3781888.

The previous prime is 3865157. The next prime is 3865187. The reversal of 3865181 is 1815683.

It can be written as a sum of positive squares in 4 ways, for example, as 25 + 3865156 = 5^2 + 1966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3865181 - 2⁶ = 3865117 is a prime.

It is a super-2 number, since 2×3865181² = 29879248325522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865187) 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, 12035 + ... + 12351.

It is an arithmetic number, because the mean of its divisors is an integer number (493695).

Almost surely, 2^3865181 is an apocalyptic number.

It is an amenable number.

3865181 is a deficient number, since it is larger than the sum of its proper divisors (84379).

3865181 is a wasteful number, since it uses less digits than its factorization.

3865181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its digits is 5760, while the sum is 32.

The square root of 3865181 is about 1966.0063580772. The cubic root of 3865181 is about 156.9362528061.

The spelling of 3865181 in words is "three million, eight hundred sixty-five thousand, one hundred eighty-one".