9987432 has 128 divisors (see below), whose sum is σ = 32659200. Its totient is φ = 2469888.

The previous prime is 9987427. The next prime is 9987433. The reversal of 9987432 is 2347899.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9987433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36994 + ... + 37262.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

Almost surely, 2^9987432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9987432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16329600).

9987432 is an abundant number, since it is smaller than the sum of its proper divisors (22671768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987432 is a wasteful number, since it uses less digits than its factorization.

9987432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 311 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 9987432 is about 3160.2898601236. The cubic root of 9987432 is about 215.3531747147.

It can be divided in two parts, 9 and 987432, that multiplied together give a palindrome (8886888).

The spelling of 9987432 in words is "nine million, nine hundred eighty-seven thousand, four hundred thirty-two".