6438253 has 2 divisors, whose sum is σ = 6438254. Its totient is φ = 6438252.

The previous prime is 6438251. The next prime is 6438269. The reversal of 6438253 is 3528346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3948169 + 2490084 = 1987^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438253 - 2¹ = 6438251 is a prime.

It is a super-2 number, since 2×6438253² = 82902203384018, which contains 22 as substring.

Together with 6438251, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 6² + 4⁹ + 3¹² + 8⁷ + 2⁵ + 5⁹ + 3¹³ .

6438253 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6438251) 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, 3219126 + 3219127.

It is an arithmetic number, because the mean of its divisors is an integer number (3219127).

Almost surely, 2^6438253 is an apocalyptic number.

It is an amenable number.

6438253 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438253 is an equidigital number, since it uses as much as digits as its factorization.

6438253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 6438253 is about 2537.3712775233. The cubic root of 6438253 is about 186.0327244230.

The spelling of 6438253 in words is "six million, four hundred thirty-eight thousand, two hundred fifty-three".