3987791 has 2 divisors, whose sum is σ = 3987792. Its totient is φ = 3987790.

The previous prime is 3987769. The next prime is 3987799. The reversal of 3987791 is 1977893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3987791 - 2⁶ = 3987727 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 (3987799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993895 + 1993896.

It is an arithmetic number, because the mean of its divisors is an integer number (1993896).

Almost surely, 2^3987791 is an apocalyptic number.

3987791 is a deficient number, since it is larger than the sum of its proper divisors (1).

3987791 is an equidigital number, since it uses as much as digits as its factorization.

3987791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 44.

The square root of 3987791 is about 1996.9454173813. The cubic root of 3987791 is about 158.5784357712.

The spelling of 3987791 in words is "three million, nine hundred eighty-seven thousand, seven hundred ninety-one".