9988405 has 24 divisors (see below), whose sum is σ = 14199840. Its totient is φ = 6723360.

The previous prime is 9988403. The next prime is 9988411. The reversal of 9988405 is 5048899.

It is a happy number.

It is not a de Polignac number, because 9988405 - 2¹ = 9988403 is a prime.

9988405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988403) 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 23 ways as a sum of consecutive naturals, for example, 14110 + ... + 14800.

It is an arithmetic number, because the mean of its divisors is an integer number (591660).

Almost surely, 2^9988405 is an apocalyptic number.

It is an amenable number.

9988405 is a deficient number, since it is larger than the sum of its proper divisors (4211435).

9988405 is a wasteful number, since it uses less digits than its factorization.

9988405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 9988405 is about 3160.4437979499. The cubic root of 9988405 is about 215.3601678982.

The spelling of 9988405 in words is "nine million, nine hundred eighty-eight thousand, four hundred five".