13443257 has 4 divisors (see below), whose sum is σ = 13453440. Its totient is φ = 13433076.

The previous prime is 13443253. The next prime is 13443259. The reversal of 13443257 is 75234431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75234431 = 37 ⋅2033363.

It is a cyclic number.

It is not a de Polignac number, because 13443257 - 2² = 13443253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13443253) 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 in 3 ways as a sum of consecutive naturals, for example, 2753 + ... + 5870.

It is an arithmetic number, because the mean of its divisors is an integer number (3363360).

Almost surely, 2^13443257 is an apocalyptic number.

It is an amenable number.

13443257 is a deficient number, since it is larger than the sum of its proper divisors (10183).

13443257 is an equidigital number, since it uses as much as digits as its factorization.

13443257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10182.

The product of its digits is 10080, while the sum is 29.

The square root of 13443257 is about 3666.5047388487. The cubic root of 13443257 is about 237.7760822675.

Adding to 13443257 its reverse (75234431), we get a palindrome (88677688).

The spelling of 13443257 in words is "thirteen million, four hundred forty-three thousand, two hundred fifty-seven".