8213853987 has 12 divisors (see below), whose sum is σ = 11981926944. Its totient is φ = 5421685200.

The previous prime is 8213853983. The next prime is 8213854009. The reversal of 8213853987 is 7893583128.

8213853987 is a `hidden beast` number, since 8 + 21 + 3 + 8 + 539 + 87 = 666.

It is not a de Polignac number, because 8213853987 - 2² = 8213853983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8213853983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4517163 + ... + 4518980.

It is an arithmetic number, because the mean of its divisors is an integer number (998493912).

Almost surely, 2^8213853987 is an apocalyptic number.

8213853987 is a deficient number, since it is larger than the sum of its proper divisors (3768072957).

8213853987 is a wasteful number, since it uses less digits than its factorization.

8213853987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9036250 (or 9036247 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 8213853987 is about 90630.3149448351. The cubic root of 8213853987 is about 2017.6646856809.

The spelling of 8213853987 in words is "eight billion, two hundred thirteen million, eight hundred fifty-three thousand, nine hundred eighty-seven".