3861881 has 2 divisors, whose sum is σ = 3861882. Its totient is φ = 3861880.

The previous prime is 3861877. The next prime is 3861889. The reversal of 3861881 is 1881683.

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., 2560000 + 1301881 = 1600^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 3861881 - 2² = 3861877 is a prime.

It is a super-2 number, since 2×3861881² = 29828249716322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3861889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930940 + 1930941.

It is an arithmetic number, because the mean of its divisors is an integer number (1930941).

Almost surely, 2^3861881 is an apocalyptic number.

It is an amenable number.

3861881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3861881 is an equidigital number, since it uses as much as digits as its factorization.

3861881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 35.

The square root of 3861881 is about 1965.1669140305. The cubic root of 3861881 is about 156.8915772707.

The spelling of 3861881 in words is "three million, eight hundred sixty-one thousand, eight hundred eighty-one".