8521998 has 64 divisors (see below), whose sum is σ = 19388160. Its totient is φ = 2483712.

The previous prime is 8521963. The next prime is 8521999. The reversal of 8521998 is 8991258.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521999) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 127161 + ... + 127227.

It is an arithmetic number, because the mean of its divisors is an integer number (302940).

Almost surely, 2^8521998 is an apocalyptic number.

8521998 is an abundant number, since it is smaller than the sum of its proper divisors (10866162).

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

8521998 is a wasteful number, since it uses less digits than its factorization.

8521998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 51840, while the sum is 42.

The square root of 8521998 is about 2919.2461355631. The cubic root of 8521998 is about 204.2586588268.

It can be divided in two parts, 852 and 1998, that added together give a triangular number (2850 = T₇₅).

The spelling of 8521998 in words is "eight million, five hundred twenty-one thousand, nine hundred ninety-eight".