8520989 has 12 divisors (see below), whose sum is σ = 9035412. Its totient is φ = 8029440.

The previous prime is 8520979. The next prime is 8521003. The reversal of 8520989 is 9890258.

It is a happy number.

8520989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 708964 + 7812025 = 842^2 + 2795^2 .

It is not a de Polignac number, because 8520989 - 2⁴ = 8520973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62129 + ... + 62265.

It is an arithmetic number, because the mean of its divisors is an integer number (752951).

Almost surely, 2^8520989 is an apocalyptic number.

It is an amenable number.

8520989 is a deficient number, since it is larger than the sum of its proper divisors (514423).

8520989 is a wasteful number, since it uses less digits than its factorization.

8520989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 8520989 is about 2919.0733118577. The cubic root of 8520989 is about 204.2505971367.

The spelling of 8520989 in words is "eight million, five hundred twenty thousand, nine hundred eighty-nine".