3856661 has 2 divisors, whose sum is σ = 3856662. Its totient is φ = 3856660.

The previous prime is 3856631. The next prime is 3856667. The reversal of 3856661 is 1666583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3352561 + 504100 = 1831^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856661 - 2⁶ = 3856597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3856667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928330 + 1928331.

It is an arithmetic number, because the mean of its divisors is an integer number (1928331).

Almost surely, 2^3856661 is an apocalyptic number.

It is an amenable number.

3856661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856661 is an equidigital number, since it uses as much as digits as its factorization.

3856661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 3856661 is about 1963.8383334684. The cubic root of 3856661 is about 156.8208566982.

The spelling of 3856661 in words is "three million, eight hundred fifty-six thousand, six hundred sixty-one".