8213987 has 2 divisors, whose sum is σ = 8213988. Its totient is φ = 8213986.

The previous prime is 8213983. The next prime is 8214007. The reversal of 8213987 is 7893128.

8213987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8213987 - 2² = 8213983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8213987.

It is not a weakly prime, because it can be changed into another prime (8213983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106993 + 4106994.

It is an arithmetic number, because the mean of its divisors is an integer number (4106994).

Almost surely, 2^8213987 is an apocalyptic number.

8213987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8213987 is an equidigital number, since it uses as much as digits as its factorization.

8213987 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 8213987 is about 2866.0054082294. The cubic root of 8213987 is about 201.7675576800.

The spelling of 8213987 in words is "eight million, two hundred thirteen thousand, nine hundred eighty-seven".