8321987 has 2 divisors, whose sum is σ = 8321988. Its totient is φ = 8321986.

The previous prime is 8321983. The next prime is 8322001. The reversal of 8321987 is 7891238.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8321987 - 2² = 8321983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8321987.

It is not a weakly prime, because it can be changed into another prime (8321983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160993 + 4160994.

It is an arithmetic number, because the mean of its divisors is an integer number (4160994).

Almost surely, 2^8321987 is an apocalyptic number.

8321987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8321987 is an equidigital number, since it uses as much as digits as its factorization.

8321987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 8321987 is about 2884.7854339621. The cubic root of 8321987 is about 202.6480104715.

The spelling of 8321987 in words is "eight million, three hundred twenty-one thousand, nine hundred eighty-seven".