3891841 has 2 divisors, whose sum is σ = 3891842. Its totient is φ = 3891840.

The previous prime is 3891821. The next prime is 3891847. The reversal of 3891841 is 1481983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3594816 + 297025 = 1896^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891841 - 2¹⁵ = 3859073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3891797 and 3891806.

It is not a weakly prime, because it can be changed into another prime (3891847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945920 + 1945921.

It is an arithmetic number, because the mean of its divisors is an integer number (1945921).

Almost surely, 2^3891841 is an apocalyptic number.

It is an amenable number.

3891841 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891841 is an equidigital number, since it uses as much as digits as its factorization.

3891841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 3891841 is about 1972.7749491516. The cubic root of 3891841 is about 157.2962478226.

The spelling of 3891841 in words is "three million, eight hundred ninety-one thousand, eight hundred forty-one".