13857817 has 4 divisors (see below), whose sum is σ = 13881780. Its totient is φ = 13833856.

The previous prime is 13857803. The next prime is 13857829. The reversal of 13857817 is 71875831.

It is a happy number.

13857817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71875831 = 47 ⋅1529273.

It can be written as a sum of positive squares in 2 ways, for example, as 4713241 + 9144576 = 2171^2 + 3024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13857817 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13857817.

It is not an unprimeable number, because it can be changed into a prime (13857887) 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, 11092 + ... + 12277.

It is an arithmetic number, because the mean of its divisors is an integer number (3470445).

Almost surely, 2^13857817 is an apocalyptic number.

It is an amenable number.

13857817 is a deficient number, since it is larger than the sum of its proper divisors (23963).

13857817 is an equidigital number, since it uses as much as digits as its factorization.

13857817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23962.

The product of its digits is 47040, while the sum is 40.

The square root of 13857817 is about 3722.6088969968. The cubic root of 13857817 is about 240.1955408706.

The spelling of 13857817 in words is "thirteen million, eight hundred fifty-seven thousand, eight hundred seventeen".