9129920 has 56 divisors (see below), whose sum is σ = 22030944. Its totient is φ = 3603456.

The previous prime is 9129893. The next prime is 9129929. The reversal of 9129920 is 299219.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9129929) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32822 + ... + 33098.

Almost surely, 2^9129920 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 9129920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11015472).

9129920 is an abundant number, since it is smaller than the sum of its proper divisors (12901024).

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

9129920 is a wasteful number, since it uses less digits than its factorization.

9129920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 9129920 is about 3021.5757478508. The cubic root of 9129920 is about 209.0045098727.

It can be divided in two parts, 91299 and 20, that added together give a palindrome (91319).

The spelling of 9129920 in words is "nine million, one hundred twenty-nine thousand, nine hundred twenty".