13401257 has 4 divisors (see below), whose sum is σ = 13468800. Its totient is φ = 13333716.

The previous prime is 13401247. The next prime is 13401281. The reversal of 13401257 is 75210431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75210431 = 17 ⋅4424143.

It is a cyclic number.

It is not a de Polignac number, because 13401257 - 2¹² = 13397161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13401217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33473 + ... + 33870.

It is an arithmetic number, because the mean of its divisors is an integer number (3367200).

Almost surely, 2^13401257 is an apocalyptic number.

It is an amenable number.

13401257 is a deficient number, since it is larger than the sum of its proper divisors (67543).

13401257 is an equidigital number, since it uses as much as digits as its factorization.

13401257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67542.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 13401257 is about 3660.7727326345. The cubic root of 13401257 is about 237.5282005295.

Adding to 13401257 its reverse (75210431), we get a palindrome (88611688).

The spelling of 13401257 in words is "thirteen million, four hundred one thousand, two hundred fifty-seven".