8521920 has 168 divisors, whose sum is σ = 32095440. Its totient is φ = 2058240.

The previous prime is 8521907. The next prime is 8521939. The reversal of 8521920 is 291258.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31546 + ... + 31814.

Almost surely, 2^8521920 is an apocalyptic number.

8521920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16047720).

8521920 is an abundant number, since it is smaller than the sum of its proper divisors (23573520).

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

8521920 is a wasteful number, since it uses less digits than its factorization.

8521920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 8521920 is about 2919.2327759190. The cubic root of 8521920 is about 204.2580356465.

It can be divided in two parts, 852 and 1920, that added together give a palindrome (2772).

The spelling of 8521920 in words is "eight million, five hundred twenty-one thousand, nine hundred twenty".