13228447 has 4 divisors (see below), whose sum is σ = 13332736. Its totient is φ = 13124160.

The previous prime is 13228441. The next prime is 13228487. The reversal of 13228447 is 74482231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74482231 = 89 ⋅836879.

It is a cyclic number.

It is not a de Polignac number, because 13228447 - 2¹¹ = 13226399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13228441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51954 + ... + 52207.

It is an arithmetic number, because the mean of its divisors is an integer number (3333184).

Almost surely, 2^13228447 is an apocalyptic number.

13228447 is a deficient number, since it is larger than the sum of its proper divisors (104289).

13228447 is a wasteful number, since it uses less digits than its factorization.

13228447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104288.

The product of its digits is 10752, while the sum is 31.

The square root of 13228447 is about 3637.0932074941. The cubic root of 13228447 is about 236.5028002297.

The spelling of 13228447 in words is "thirteen million, two hundred twenty-eight thousand, four hundred forty-seven".