9988623 has 16 divisors (see below), whose sum is σ = 15577600. Its totient is φ = 6308280.

The previous prime is 9988609. The next prime is 9988633. The reversal of 9988623 is 3268899.

It is not a de Polignac number, because 9988623 - 2⁴ = 9988607 is a prime.

It is a super-2 number, since 2×9988623² = 199545178872258, 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 (9988633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9223 + ... + 10248.

It is an arithmetic number, because the mean of its divisors is an integer number (973600).

Almost surely, 2^9988623 is an apocalyptic number.

9988623 is a deficient number, since it is larger than the sum of its proper divisors (5588977).

9988623 is a wasteful number, since it uses less digits than its factorization.

9988623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19499 (or 19493 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 9988623 is about 3160.4782865889. The cubic root of 9988623 is about 215.3617346541.

The spelling of 9988623 in words is "nine million, nine hundred eighty-eight thousand, six hundred twenty-three".