3856691 has 4 divisors (see below), whose sum is σ = 3882384. Its totient is φ = 3831000.

The previous prime is 3856667. The next prime is 3856703. The reversal of 3856691 is 1966583.

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

It is a cyclic number.

It is not a de Polignac number, because 3856691 - 2¹⁰ = 3855667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3856631) by changing a digit.

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, 12620 + ... + 12921.

It is an arithmetic number, because the mean of its divisors is an integer number (970596).

Almost surely, 2^3856691 is an apocalyptic number.

3856691 is a deficient number, since it is larger than the sum of its proper divisors (25693).

3856691 is a wasteful number, since it uses less digits than its factorization.

3856691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25692.

The product of its digits is 38880, while the sum is 38.

The square root of 3856691 is about 1963.8459715568. The cubic root of 3856691 is about 156.8212633206.

The spelling of 3856691 in words is "three million, eight hundred fifty-six thousand, six hundred ninety-one".