13857257 has 4 divisors (see below), whose sum is σ = 13880916. Its totient is φ = 13833600.

The previous prime is 13857253. The next prime is 13857269. The reversal of 13857257 is 75275831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12559936 + 1297321 = 3544^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 13857257 - 2² = 13857253 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 13857257.

It is not an unprimeable number, because it can be changed into a prime (13857253) 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, 10928 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (3470229).

Almost surely, 2^13857257 is an apocalyptic number.

It is an amenable number.

13857257 is a deficient number, since it is larger than the sum of its proper divisors (23659).

13857257 is an equidigital number, since it uses as much as digits as its factorization.

13857257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23658.

The product of its digits is 58800, while the sum is 38.

The square root of 13857257 is about 3722.5336801700. The cubic root of 13857257 is about 240.1923053606.

The spelling of 13857257 in words is "thirteen million, eight hundred fifty-seven thousand, two hundred fifty-seven".