13457257 has 6 divisors (see below), whose sum is σ = 14791994. Its totient is φ = 12233760.

The previous prime is 13457243. The next prime is 13457261. The reversal of 13457257 is 75275431.

It can be written as a sum of positive squares in only one way, i.e., 12702096 + 755161 = 3564^2 + 869^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13457257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13457357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55488 + ... + 55729.

Almost surely, 2^13457257 is an apocalyptic number.

It is an amenable number.

13457257 is a deficient number, since it is larger than the sum of its proper divisors (1334737).

13457257 is a wasteful number, since it uses less digits than its factorization.

13457257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111239 (or 111228 counting only the distinct ones).

The product of its digits is 29400, while the sum is 34.

The square root of 13457257 is about 3668.4134172691. The cubic root of 13457257 is about 237.8585947678.

The spelling of 13457257 in words is "thirteen million, four hundred fifty-seven thousand, two hundred fifty-seven".