8387891 has 2 divisors, whose sum is σ = 8387892. Its totient is φ = 8387890.

The previous prime is 8387879. The next prime is 8387917. The reversal of 8387891 is 1987838.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8387891 - 2¹⁴ = 8371507 is a prime.

It is a super-3 number, since 3×8387891³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8387831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4193945 + 4193946.

It is an arithmetic number, because the mean of its divisors is an integer number (4193946).

Almost surely, 2^8387891 is an apocalyptic number.

8387891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8387891 is an equidigital number, since it uses as much as digits as its factorization.

8387891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 8387891 is about 2896.1855948817. The cubic root of 8387891 is about 203.1815454725.

The spelling of 8387891 in words is "eight million, three hundred eighty-seven thousand, eight hundred ninety-one".