9871278387 has 8 divisors (see below), whose sum is σ = 13177030080. Its totient is φ = 6573189480.

The previous prime is 9871278337. The next prime is 9871278397. The reversal of 9871278387 is 7838721789.

9871278387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9871278387 - 2¹² = 9871274291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9871278387.

It is not an unprimeable number, because it can be changed into a prime (9871278337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912689 + ... + 1917842.

It is an arithmetic number, because the mean of its divisors is an integer number (1647128760).

Almost surely, 2^9871278387 is an apocalyptic number.

9871278387 is a deficient number, since it is larger than the sum of its proper divisors (3305751693).

9871278387 is a wasteful number, since it uses less digits than its factorization.

9871278387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831393.

The product of its digits is 9483264, while the sum is 60.

The square root of 9871278387 is about 99354.3073399437. The cubic root of 9871278387 is about 2145.1506632345.

The spelling of 9871278387 in words is "nine billion, eight hundred seventy-one million, two hundred seventy-eight thousand, three hundred eighty-seven".