8520840 has 48 divisors (see below), whose sum is σ = 27693900. Its totient is φ = 2272128.

The previous prime is 8520829. The next prime is 8520851. The reversal of 8520840 is 480258.

It is an interprime number because it is at equal distance from previous prime (8520829) and next prime (8520851).

It can be written as a sum of positive squares in 2 ways, for example, as 8328996 + 191844 = 2886^2 + 438^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 11475 + ... + 12194.

Almost surely, 2^8520840 is an apocalyptic number.

It is an amenable number.

8520840 is an abundant number, since it is smaller than the sum of its proper divisors (19173060).

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

8520840 is a wasteful number, since it uses less digits than its factorization.

8520840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23686 (or 23679 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 8520840 is about 2919.0477899479. The cubic root of 8520840 is about 204.2494066052.

The spelling of 8520840 in words is "eight million, five hundred twenty thousand, eight hundred forty".