9988389 has 6 divisors (see below), whose sum is σ = 14427686. Its totient is φ = 6658920.

The previous prime is 9988373. The next prime is 9988397. The reversal of 9988389 is 9838899.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 1520289 = 2910^2 + 1233^2 .

It is not a de Polignac number, because 9988389 - 2⁴ = 9988373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554902 + ... + 554919.

Almost surely, 2^9988389 is an apocalyptic number.

It is an amenable number.

9988389 is a deficient number, since it is larger than the sum of its proper divisors (4439297).

9988389 is a wasteful number, since it uses less digits than its factorization.

9988389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109827 (or 1109824 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 9988389 is about 3160.4412666588. The cubic root of 9988389 is about 215.3600529061.

It can be divided in two parts, 99 and 88389, that added together give a palindrome (88488).

The spelling of 9988389 in words is "nine million, nine hundred eighty-eight thousand, three hundred eighty-nine".