8642489 has 2 divisors, whose sum is σ = 8642490. Its totient is φ = 8642488.

The previous prime is 8642467. The next prime is 8642507. The reversal of 8642489 is 9842468.

8642489 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8602489 + 40000 = 2933^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 8642489 - 2²⁰ = 7593913 is a prime.

It is a super-2 number, since 2×8642489² = 149385232230242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8642429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321244 + 4321245.

It is an arithmetic number, because the mean of its divisors is an integer number (4321245).

Almost surely, 2^8642489 is an apocalyptic number.

It is an amenable number.

8642489 is a deficient number, since it is larger than the sum of its proper divisors (1).

8642489 is an equidigital number, since it uses as much as digits as its factorization.

8642489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 41.

The square root of 8642489 is about 2939.8110483499. The cubic root of 8642489 is about 205.2168160155.

The spelling of 8642489 in words is "eight million, six hundred forty-two thousand, four hundred eighty-nine".