3856647 has 4 divisors (see below), whose sum is σ = 5142200. Its totient is φ = 2571096.

The previous prime is 3856631. The next prime is 3856661. The reversal of 3856647 is 7466583.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3856647 - 2⁴ = 3856631 is a prime.

It is a d-powerful number, because it can be written as 3³ + 8⁷ + 5 + 6⁶ + 6⁸ + 4⁷ + 7⁵ .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642772 + ... + 642777.

It is an arithmetic number, because the mean of its divisors is an integer number (1285550).

Almost surely, 2^3856647 is an apocalyptic number.

3856647 is a deficient number, since it is larger than the sum of its proper divisors (1285553).

3856647 is a wasteful number, since it uses less digits than its factorization.

3856647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285552.

The product of its digits is 120960, while the sum is 39.

The square root of 3856647 is about 1963.8347690170. The cubic root of 3856647 is about 156.8206669404.

The spelling of 3856647 in words is "three million, eight hundred fifty-six thousand, six hundred forty-seven".