9988231 has 16 divisors (see below), whose sum is σ = 11916288. Its totient is φ = 8265600.

The previous prime is 9988229. The next prime is 9988249. The reversal of 9988231 is 1328899.

It is a cyclic number.

It is not a de Polignac number, because 9988231 - 2¹ = 9988229 is a prime.

It is a super-2 number, since 2×9988231² = 199529517018722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4936 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (744768).

Almost surely, 2^9988231 is an apocalyptic number.

9988231 is a deficient number, since it is larger than the sum of its proper divisors (1928057).

9988231 is a wasteful number, since it uses less digits than its factorization.

9988231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 31104, while the sum is 40.

The square root of 9988231 is about 3160.4162700505. The cubic root of 9988231 is about 215.3589173520.

It can be divided in two parts, 998 and 8231, that added together give a palindrome (9229).

The spelling of 9988231 in words is "nine million, nine hundred eighty-eight thousand, two hundred thirty-one".