3898991 has 2 divisors, whose sum is σ = 3898992. Its totient is φ = 3898990.

The previous prime is 3898981. The next prime is 3899011. The reversal of 3898991 is 1998983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3898991 - 2⁶ = 3898927 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3898981) 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, 1949495 + 1949496.

It is an arithmetic number, because the mean of its divisors is an integer number (1949496).

Almost surely, 2^3898991 is an apocalyptic number.

3898991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3898991 is an equidigital number, since it uses as much as digits as its factorization.

3898991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 3898991 is about 1974.5862857824. The cubic root of 3898991 is about 157.3925158986.

The spelling of 3898991 in words is "three million, eight hundred ninety-eight thousand, nine hundred ninety-one".