8787409 has 2 divisors, whose sum is σ = 8787410. Its totient is φ = 8787408.

The previous prime is 8787391. The next prime is 8787413. The reversal of 8787409 is 9047878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8427409 + 360000 = 2903^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 8787409 - 2⁷ = 8787281 is a prime.

It is a d-powerful number, because it can be written as 8⁵ + 7⁴ + 8⁷ + 7⁷ + 4¹⁰ + 0 + 9⁷ .

8787409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8787109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4393704 + 4393705.

It is an arithmetic number, because the mean of its divisors is an integer number (4393705).

Almost surely, 2^8787409 is an apocalyptic number.

It is an amenable number.

8787409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8787409 is an equidigital number, since it uses as much as digits as its factorization.

8787409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 8787409 is about 2964.3564225646. The cubic root of 8787409 is about 206.3575106461.

The spelling of 8787409 in words is "eight million, seven hundred eighty-seven thousand, four hundred nine".