3871841 has 2 divisors, whose sum is σ = 3871842. Its totient is φ = 3871840.

The previous prime is 3871831. The next prime is 3871871. The reversal of 3871841 is 1481783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3763600 + 108241 = 1940^2 + 329^2 .

It is an emirp because it is prime and its reverse (1481783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3871841 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p₂₇₄₇₃₉ and since 3871841 and 274739 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 3871798 and 3871807.

It is not a weakly prime, because it can be changed into another prime (3871811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1935920 + 1935921.

It is an arithmetic number, because the mean of its divisors is an integer number (1935921).

Almost surely, 2^3871841 is an apocalyptic number.

It is an amenable number.

3871841 is a deficient number, since it is larger than the sum of its proper divisors (1).

3871841 is an equidigital number, since it uses as much as digits as its factorization.

3871841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 3871841 is about 1967.6994181023. The cubic root of 3871841 is about 157.0263387728.

The spelling of 3871841 in words is "three million, eight hundred seventy-one thousand, eight hundred forty-one".