6400259 has 2 divisors, whose sum is σ = 6400260. Its totient is φ = 6400258.

The previous prime is 6400253. The next prime is 6400349. The reversal of 6400259 is 9520046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6400259 - 2¹⁶ = 6334723 is a prime.

It is not a weakly prime, because it can be changed into another prime (6400253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200129 + 3200130.

It is an arithmetic number, because the mean of its divisors is an integer number (3200130).

Almost surely, 2^6400259 is an apocalyptic number.

6400259 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400259 is an equidigital number, since it uses as much as digits as its factorization.

6400259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 6400259 is about 2529.8733169864. The cubic root of 6400259 is about 185.6660578347. Note that the first 3 decimals are identical.

The spelling of 6400259 in words is "six million, four hundred thousand, two hundred fifty-nine".