9988749 has 6 divisors (see below), whose sum is σ = 14428206. Its totient is φ = 6659160.

The previous prime is 9988747. The next prime is 9988753. The reversal of 9988749 is 9478899.

It can be written as a sum of positive squares in only one way, i.e., 5336100 + 4652649 = 2310^2 + 2157^2 .

It is not a de Polignac number, because 9988749 - 2¹ = 9988747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9988695 and 9988704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988747) 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 5 ways as a sum of consecutive naturals, for example, 554922 + ... + 554939.

It is an arithmetic number, because the mean of its divisors is an integer number (2404701).

Almost surely, 2^9988749 is an apocalyptic number.

It is an amenable number.

9988749 is a deficient number, since it is larger than the sum of its proper divisors (4439457).

9988749 is a wasteful number, since it uses less digits than its factorization.

9988749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109867 (or 1109864 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 9988749 is about 3160.4982202178. The cubic root of 9988749 is about 215.3626401998.

The spelling of 9988749 in words is "nine million, nine hundred eighty-eight thousand, seven hundred forty-nine".