9861287 has 4 divisors (see below), whose sum is σ = 9936696. Its totient is φ = 9785880.

The previous prime is 9861253. The next prime is 9861301. The reversal of 9861287 is 7821689.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9861287 - 2⁶ = 9861223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37508 + ... + 37769.

It is an arithmetic number, because the mean of its divisors is an integer number (2484174).

Almost surely, 2^9861287 is an apocalyptic number.

9861287 is a deficient number, since it is larger than the sum of its proper divisors (75409).

9861287 is a wasteful number, since it uses less digits than its factorization.

9861287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75408.

The product of its digits is 48384, while the sum is 41.

The square root of 9861287 is about 3140.2686190834. The cubic root of 9861287 is about 214.4426668329.

The spelling of 9861287 in words is "nine million, eight hundred sixty-one thousand, two hundred eighty-seven".