13257224 has 8 divisors (see below), whose sum is σ = 24857310. Its totient is φ = 6628608.

The previous prime is 13257221. The next prime is 13257253. The reversal of 13257224 is 42275231.

It can be written as a sum of positive squares in only one way, i.e., 6916900 + 6340324 = 2630^2 + 2518^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 13257193 and 13257202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13257221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828569 + ... + 828584.

Almost surely, 2^13257224 is an apocalyptic number.

It is an amenable number.

13257224 is a deficient number, since it is larger than the sum of its proper divisors (11600086).

13257224 is a wasteful number, since it uses less digits than its factorization.

13257224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657159 (or 1657155 counting only the distinct ones).

The product of its digits is 3360, while the sum is 26.

The square root of 13257224 is about 3641.0471021397. The cubic root of 13257224 is about 236.6741711125.

The spelling of 13257224 in words is "thirteen million, two hundred fifty-seven thousand, two hundred twenty-four".