8785409 has 2 divisors, whose sum is σ = 8785410. Its totient is φ = 8785408.

The previous prime is 8785397. The next prime is 8785417. The reversal of 8785409 is 9045878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7924225 + 861184 = 2815^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 8785409 - 2¹⁶ = 8719873 is a prime.

It is a super-2 number, since 2×8785409² = 154366822594562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8785489) 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 as a sum of consecutive naturals, namely, 4392704 + 4392705.

It is an arithmetic number, because the mean of its divisors is an integer number (4392705).

Almost surely, 2^8785409 is an apocalyptic number.

It is an amenable number.

8785409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8785409 is an equidigital number, since it uses as much as digits as its factorization.

8785409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 8785409 is about 2964.0190620170. The cubic root of 8785409 is about 206.3418539136.

The spelling of 8785409 in words is "eight million, seven hundred eighty-five thousand, four hundred nine".