3859865 has 4 divisors (see below), whose sum is σ = 4631844. Its totient is φ = 3087888.

The previous prime is 3859847. The next prime is 3859879. The reversal of 3859865 is 5689583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5689583 = 1823 ⋅3121.

It can be written as a sum of positive squares in 2 ways, for example, as 2968729 + 891136 = 1723^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 3859865 - 2¹² = 3855769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 385982 + ... + 385991.

It is an arithmetic number, because the mean of its divisors is an integer number (1157961).

Almost surely, 2^3859865 is an apocalyptic number.

It is an amenable number.

3859865 is a deficient number, since it is larger than the sum of its proper divisors (771979).

3859865 is an equidigital number, since it uses as much as digits as its factorization.

3859865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771978.

The product of its digits is 259200, while the sum is 44.

The square root of 3859865 is about 1964.6539135430. The cubic root of 3859865 is about 156.8642720557.

The spelling of 3859865 in words is "three million, eight hundred fifty-nine thousand, eight hundred sixty-five".