3858991 has 2 divisors, whose sum is σ = 3858992. Its totient is φ = 3858990.

The previous prime is 3858971. The next prime is 3858997. The reversal of 3858991 is 1998583.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3858991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3858997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1929495 + 1929496.

It is an arithmetic number, because the mean of its divisors is an integer number (1929496).

Almost surely, 2^3858991 is an apocalyptic number.

3858991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3858991 is an equidigital number, since it uses as much as digits as its factorization.

3858991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 3858991 is about 1964.4314699169. The cubic root of 3858991 is about 156.8524314237.

The spelling of 3858991 in words is "three million, eight hundred fifty-eight thousand, nine hundred ninety-one".