8521864 has 32 divisors (see below), whose sum is σ = 17478720. Its totient is φ = 3871296.

The previous prime is 8521841. The next prime is 8521867. The reversal of 8521864 is 4681258.

It is not an unprimeable number, because it can be changed into a prime (8521867) 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 7 ways as a sum of consecutive naturals, for example, 6357 + ... + 7579.

It is an arithmetic number, because the mean of its divisors is an integer number (546210).

Almost surely, 2^8521864 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 8521864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8739360).

8521864 is an abundant number, since it is smaller than the sum of its proper divisors (8956856).

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

8521864 is a wasteful number, since it uses less digits than its factorization.

8521864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1305 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 8521864 is about 2919.2231843420. The cubic root of 8521864 is about 204.2575882326.

Subtracting from 8521864 its reverse (4681258), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 8521864 in words is "eight million, five hundred twenty-one thousand, eight hundred sixty-four".