3856381 has 2 divisors, whose sum is σ = 3856382. Its totient is φ = 3856380.

The previous prime is 3856379. The next prime is 3856393. The reversal of 3856381 is 1836583.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 793881 = 1750^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856381 - 2¹ = 3856379 is a prime.

It is a super-2 number, since 2×3856381² = 29743348834322, which contains 22 as substring.

Together with 3856379, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3856361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928190 + 1928191.

It is an arithmetic number, because the mean of its divisors is an integer number (1928191).

Almost surely, 2^3856381 is an apocalyptic number.

It is an amenable number.

3856381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856381 is an equidigital number, since it uses as much as digits as its factorization.

3856381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 3856381 is about 1963.7670432106. The cubic root of 3856381 is about 156.8170614548.

The spelling of 3856381 in words is "three million, eight hundred fifty-six thousand, three hundred eighty-one".