13445257 has 8 divisors (see below), whose sum is σ = 15680000. Its totient is φ = 11524212.

The previous prime is 13445251. The next prime is 13445279. The reversal of 13445257 is 75254431.

It is not a de Polignac number, because 13445257 - 2¹⁵ = 13412489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13445251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19257 + ... + 19942.

It is an arithmetic number, because the mean of its divisors is an integer number (1960000).

Almost surely, 2^13445257 is an apocalyptic number.

It is an amenable number.

13445257 is a deficient number, since it is larger than the sum of its proper divisors (2234743).

13445257 is an frugal number, since it uses more digits than its factorization.

13445257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39220 (or 39206 counting only the distinct ones).

The product of its digits is 16800, while the sum is 31.

The square root of 13445257 is about 3666.7774680228. Note that the first 3 decimals coincide. The cubic root of 13445257 is about 237.7878732737.

Adding to 13445257 its reverse (75254431), we get a palindrome (88699688).

The spelling of 13445257 in words is "thirteen million, four hundred forty-five thousand, two hundred fifty-seven".