6400253 has 2 divisors, whose sum is σ = 6400254. Its totient is φ = 6400252.

The previous prime is 6400241. The next prime is 6400259. The reversal of 6400253 is 3520046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3452164 + 2948089 = 1858^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400253 - 2⁶ = 6400189 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200126 + 3200127.

It is an arithmetic number, because the mean of its divisors is an integer number (3200127).

Almost surely, 2^6400253 is an apocalyptic number.

It is an amenable number.

6400253 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400253 is an equidigital number, since it uses as much as digits as its factorization.

6400253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 6400253 is about 2529.8721311560. The cubic root of 6400253 is about 185.6659998164.

Adding to 6400253 its reverse (3520046), we get a palindrome (9920299).

The spelling of 6400253 in words is "six million, four hundred thousand, two hundred fifty-three".