13278257 has 4 divisors (see below), whose sum is σ = 13438320. Its totient is φ = 13118196.

The previous prime is 13278247. The next prime is 13278263. The reversal of 13278257 is 75287231.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13278257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13278217) 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, 79907 + ... + 80072.

It is an arithmetic number, because the mean of its divisors is an integer number (3359580).

Almost surely, 2^13278257 is an apocalyptic number.

It is an amenable number.

13278257 is a deficient number, since it is larger than the sum of its proper divisors (160063).

13278257 is an equidigital number, since it uses as much as digits as its factorization.

13278257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160062.

The product of its digits is 23520, while the sum is 35.

The square root of 13278257 is about 3643.9342749287. The cubic root of 13278257 is about 236.7992686340.

The spelling of 13278257 in words is "thirteen million, two hundred seventy-eight thousand, two hundred fifty-seven".