8640259 has 2 divisors, whose sum is σ = 8640260. Its totient is φ = 8640258.

The previous prime is 8640251. The next prime is 8640263. The reversal of 8640259 is 9520468.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8640259 - 2³ = 8640251 is a prime.

It is not a weakly prime, because it can be changed into another prime (8640251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320129 + 4320130.

It is an arithmetic number, because the mean of its divisors is an integer number (4320130).

Almost surely, 2^8640259 is an apocalyptic number.

8640259 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640259 is an equidigital number, since it uses as much as digits as its factorization.

8640259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 8640259 is about 2939.4317478043. The cubic root of 8640259 is about 205.1991639685.

The spelling of 8640259 in words is "eight million, six hundred forty thousand, two hundred fifty-nine".