9991382 has 4 divisors (see below), whose sum is σ = 14987076. Its totient is φ = 4995690.

The previous prime is 9991379. The next prime is 9991409. The reversal of 9991382 is 2831999.

9991382 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497844 + ... + 2497847.

It is an arithmetic number, because the mean of its divisors is an integer number (3746769).

Almost surely, 2^9991382 is an apocalyptic number.

9991382 is a deficient number, since it is larger than the sum of its proper divisors (4995694).

9991382 is a wasteful number, since it uses less digits than its factorization.

9991382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995693.

The product of its digits is 34992, while the sum is 41.

The square root of 9991382 is about 3160.9147410204. The cubic root of 9991382 is about 215.3815614886.

The spelling of 9991382 in words is "nine million, nine hundred ninety-one thousand, three hundred eighty-two".