9991376 has 40 divisors (see below), whose sum is σ = 20746440. Its totient is φ = 4644864.

The previous prime is 9991357. The next prime is 9991379. The reversal of 9991376 is 6731999.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2483776 + 7507600 = 1576^2 + 2740^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29480 + ... + 29816.

It is an arithmetic number, because the mean of its divisors is an integer number (518661).

Almost surely, 2^9991376 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 9991376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10373220).

9991376 is an abundant number, since it is smaller than the sum of its proper divisors (10755064).

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

9991376 is a wasteful number, since it uses less digits than its factorization.

9991376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 465 counting only the distinct ones).

The product of its digits is 91854, while the sum is 44.

The square root of 9991376 is about 3160.9137919279. The cubic root of 9991376 is about 215.3815183751.

The spelling of 9991376 in words is "nine million, nine hundred ninety-one thousand, three hundred seventy-six".