3856505 has 4 divisors (see below), whose sum is σ = 4627812. Its totient is φ = 3085200.

The previous prime is 3856499. The next prime is 3856511. The reversal of 3856505 is 5056583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5056583 = 7 ⋅722369.

It is an interprime number because it is at equal distance from previous prime (3856499) and next prime (3856511).

It can be written as a sum of positive squares in 2 ways, for example, as 1283689 + 2572816 = 1133^2 + 1604^2 .

It is not a de Polignac number, because 3856505 - 2²⁰ = 2807929 is a prime.

It is an alternating number because its digits alternate between odd and even.

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, 385646 + ... + 385655.

It is an arithmetic number, because the mean of its divisors is an integer number (1156953).

Almost surely, 2^3856505 is an apocalyptic number.

It is an amenable number.

3856505 is a deficient number, since it is larger than the sum of its proper divisors (771307).

3856505 is an equidigital number, since it uses as much as digits as its factorization.

3856505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771306.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 3856505 is about 1963.7986149297. The cubic root of 3856505 is about 156.8187422281.

The spelling of 3856505 in words is "three million, eight hundred fifty-six thousand, five hundred five".