3888991 has 2 divisors, whose sum is σ = 3888992. Its totient is φ = 3888990.

The previous prime is 3888967. The next prime is 3889007. The reversal of 3888991 is 1998883.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3888991 is a 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 (3888931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1944495 + 1944496.

It is an arithmetic number, because the mean of its divisors is an integer number (1944496).

Almost surely, 2^3888991 is an apocalyptic number.

3888991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3888991 is an equidigital number, since it uses as much as digits as its factorization.

3888991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The square root of 3888991 is about 1972.0524840886. The cubic root of 3888991 is about 157.2578423670.

The spelling of 3888991 in words is "three million, eight hundred eighty-eight thousand, nine hundred ninety-one".