4391887 has 2 divisors, whose sum is σ = 4391888. Its totient is φ = 4391886.

The previous prime is 4391867. The next prime is 4391897. The reversal of 4391887 is 7881934.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4391887 - 2¹¹ = 4389839 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4391857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2195943 + 2195944.

It is an arithmetic number, because the mean of its divisors is an integer number (2195944).

Almost surely, 2^4391887 is an apocalyptic number.

4391887 is a deficient number, since it is larger than the sum of its proper divisors (1).

4391887 is an equidigital number, since it uses as much as digits as its factorization.

4391887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 4391887 is about 2095.6829435771. The cubic root of 4391887 is about 163.7634777089.

The spelling of 4391887 in words is "four million, three hundred ninety-one thousand, eight hundred eighty-seven".