9871389 has 28 divisors (see below), whose sum is σ = 16158912. Its totient is φ = 5977800.

The previous prime is 9871357. The next prime is 9871391. The reversal of 9871389 is 9831789.

It is not a de Polignac number, because 9871389 - 2⁵ = 9871357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871189) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7404 + ... + 8634.

It is an arithmetic number, because the mean of its divisors is an integer number (577104).

Almost surely, 2^9871389 is an apocalyptic number.

9871389 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

9871389 is a deficient number, since it is larger than the sum of its proper divisors (6287523).

9871389 is a wasteful number, since it uses less digits than its factorization.

9871389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1245 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 9871389 is about 3141.8766684897. The cubic root of 9871389 is about 214.5158675728.

The spelling of 9871389 in words is "nine million, eight hundred seventy-one thousand, three hundred eighty-nine".