3856631 has 2 divisors, whose sum is σ = 3856632. Its totient is φ = 3856630.

The previous prime is 3856613. The next prime is 3856661. The reversal of 3856631 is 1366583.

Together with previous prime (3856613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3856631 is a prime.

It is a super-2 number, since 2×3856631² = 29747205340322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3856661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928315 + 1928316.

It is an arithmetic number, because the mean of its divisors is an integer number (1928316).

Almost surely, 2^3856631 is an apocalyptic number.

3856631 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856631 is an equidigital number, since it uses as much as digits as its factorization.

3856631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 3856631 is about 1963.8306953503. The cubic root of 3856631 is about 156.8204500738.

The spelling of 3856631 in words is "three million, eight hundred fifty-six thousand, six hundred thirty-one".