8490509 has 4 divisors (see below), whose sum is σ = 8523804. Its totient is φ = 8457216.

The previous prime is 8490499. The next prime is 8490539. The reversal of 8490509 is 9050948.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3880900 + 4609609 = 1970^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 8490509 - 2⁸ = 8490253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8490539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16262 + ... + 16775.

It is an arithmetic number, because the mean of its divisors is an integer number (2130951).

Almost surely, 2^8490509 is an apocalyptic number.

It is an amenable number.

8490509 is a deficient number, since it is larger than the sum of its proper divisors (33295).

8490509 is a wasteful number, since it uses less digits than its factorization.

8490509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33294.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 8490509 is about 2913.8477997315. The cubic root of 8490509 is about 204.0067680056.

The spelling of 8490509 in words is "eight million, four hundred ninety thousand, five hundred nine".