9911920 has 40 divisors (see below), whose sum is σ = 24261840. Its totient is φ = 3755520.

The previous prime is 9911917. The next prime is 9911929. The reversal of 9911920 is 291199.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741 + ... + 4780.

It is an arithmetic number, because the mean of its divisors is an integer number (606546).

Almost surely, 2^9911920 is an apocalyptic number.

It is an amenable number.

9911920 is an abundant number, since it is smaller than the sum of its proper divisors (14349920).

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

9911920 is a wasteful number, since it uses less digits than its factorization.

9911920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6553 (or 6547 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 9911920 is about 3148.3201870204. The cubic root of 9911920 is about 214.8090606935.

The spelling of 9911920 in words is "nine million, nine hundred eleven thousand, nine hundred twenty".