9871387 has 4 divisors (see below), whose sum is σ = 9890856. Its totient is φ = 9851920.

The previous prime is 9871357. The next prime is 9871391. The reversal of 9871387 is 7831789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7831789 = 7 ⋅1118827.

It is a cyclic number.

It is not a de Polignac number, because 9871387 - 2⁷ = 9871259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9871307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8953 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (2472714).

Almost surely, 2^9871387 is an apocalyptic number.

9871387 is a deficient number, since it is larger than the sum of its proper divisors (19469).

9871387 is a wasteful number, since it uses less digits than its factorization.

9871387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19468.

The product of its digits is 84672, while the sum is 43.

The square root of 9871387 is about 3141.8763502086. The cubic root of 9871387 is about 214.5158530854.

The spelling of 9871387 in words is "nine million, eight hundred seventy-one thousand, three hundred eighty-seven".