8921520 has 60 divisors (see below), whose sum is σ = 29963856. Its totient is φ = 2378880.

The previous prime is 8921467. The next prime is 8921569. The reversal of 8921520 is 251298.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×8921520² = 159187038220800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5476 + ... + 6915.

Almost surely, 2^8921520 is an apocalyptic number.

8921520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8921520 is an abundant number, since it is smaller than the sum of its proper divisors (21042336).

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

8921520 is a wasteful number, since it uses less digits than its factorization.

8921520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12410 (or 12401 counting only the distinct ones).

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

The square root of 8921520 is about 2986.8913605955. The cubic root of 8921520 is about 207.4020053078.

It can be divided in two parts, 89 and 21520, that added together give a square (21609 = 147²).

The spelling of 8921520 in words is "eight million, nine hundred twenty-one thousand, five hundred twenty".