3856657 has 4 divisors (see below), whose sum is σ = 4407616. Its totient is φ = 3305700.

The previous prime is 3856631. The next prime is 3856661. The reversal of 3856657 is 7566583.

3856657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7566583 = 1613 ⋅4691.

It is a cyclic number.

It is not a de Polignac number, because 3856657 - 2¹⁵ = 3823889 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275469 + ... + 275482.

It is an arithmetic number, because the mean of its divisors is an integer number (1101904).

Almost surely, 2^3856657 is an apocalyptic number.

It is an amenable number.

3856657 is a deficient number, since it is larger than the sum of its proper divisors (550959).

3856657 is an equidigital number, since it uses as much as digits as its factorization.

3856657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550958.

The product of its digits is 151200, while the sum is 40.

The square root of 3856657 is about 1963.8373150544. The cubic root of 3856657 is about 156.8208024818.

The spelling of 3856657 in words is "three million, eight hundred fifty-six thousand, six hundred fifty-seven".