3865143 has 8 divisors (see below), whose sum is σ = 5238256. Its totient is φ = 2534400.

The previous prime is 3865133. The next prime is 3865153. The reversal of 3865143 is 3415683.

It is an interprime number because it is at equal distance from previous prime (3865133) and next prime (3865153).

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

It is not a de Polignac number, because 3865143 - 2⁶ = 3865079 is a prime.

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 3865143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865123) 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, 10378 + ... + 10743.

It is an arithmetic number, because the mean of its divisors is an integer number (654782).

Almost surely, 2^3865143 is an apocalyptic number.

3865143 is a deficient number, since it is larger than the sum of its proper divisors (1373113).

3865143 is a wasteful number, since it uses less digits than its factorization.

3865143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21185.

The product of its digits is 8640, while the sum is 30.

The square root of 3865143 is about 1965.9966937917. The cubic root of 3865143 is about 156.9357385053.

Adding to 3865143 its product of digits (8640), we get a palindrome (3873783).

The spelling of 3865143 in words is "three million, eight hundred sixty-five thousand, one hundred forty-three".