8389520 has 20 divisors (see below), whose sum is σ = 19505820. Its totient is φ = 3355776.

The previous prime is 8389519. The next prime is 8389523. The reversal of 8389520 is 259838.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 5513104 = 1696^2 + 2348^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8389523) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52355 + ... + 52514.

It is an arithmetic number, because the mean of its divisors is an integer number (975291).

Almost surely, 2^8389520 is an apocalyptic number.

8389520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8389520 is an abundant number, since it is smaller than the sum of its proper divisors (11116300).

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

8389520 is a wasteful number, since it uses less digits than its factorization.

8389520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104882 (or 104876 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 8389520 is about 2896.4668132054. The cubic root of 8389520 is about 203.1946978177.

The spelling of 8389520 in words is "eight million, three hundred eighty-nine thousand, five hundred twenty".