9841987 has 2 divisors, whose sum is σ = 9841988. Its totient is φ = 9841986.

The previous prime is 9841939. The next prime is 9842011. The reversal of 9841987 is 7891489.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9841987 - 2¹¹ = 9839939 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9841087) 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, 4920993 + 4920994.

It is an arithmetic number, because the mean of its divisors is an integer number (4920994).

Almost surely, 2^9841987 is an apocalyptic number.

9841987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9841987 is an equidigital number, since it uses as much as digits as its factorization.

9841987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 9841987 is about 3137.1941285168. The cubic root of 9841987 is about 214.3026767736.

The spelling of 9841987 in words is "nine million, eight hundred forty-one thousand, nine hundred eighty-seven".