9991380 has 48 divisors (see below), whose sum is σ = 31973760. Its totient is φ = 2283648.

The previous prime is 9991379. The next prime is 9991409. The reversal of 9991380 is 831999.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11475 + ... + 12314.

It is an arithmetic number, because the mean of its divisors is an integer number (666120).

Almost surely, 2^9991380 is an apocalyptic number.

It is an amenable number.

9991380 is an abundant number, since it is smaller than the sum of its proper divisors (21982380).

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

9991380 is a wasteful number, since it uses less digits than its factorization.

9991380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23808 (or 23806 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 9991380 is about 3160.9144246563. The cubic root of 9991380 is about 215.3815471175.

The spelling of 9991380 in words is "nine million, nine hundred ninety-one thousand, three hundred eighty".