13856417 has 4 divisors (see below), whose sum is σ = 13864260. Its totient is φ = 13848576.

The previous prime is 13856413. The next prime is 13856441. The reversal of 13856417 is 71465831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3845521 + 10010896 = 1961^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 13856417 - 2² = 13856413 is a prime.

It is a super-3 number, since 3×13856417³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13856413) 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, 113 + ... + 5265.

It is an arithmetic number, because the mean of its divisors is an integer number (3466065).

It is a Poulet number, since it divides 2^13856416-1.

Almost surely, 2^13856417 is an apocalyptic number.

It is an amenable number.

13856417 is a deficient number, since it is larger than the sum of its proper divisors (7843).

13856417 is an equidigital number, since it uses as much as digits as its factorization.

13856417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7842.

The product of its digits is 20160, while the sum is 35.

The square root of 13856417 is about 3722.4208520800. The cubic root of 13856417 is about 240.1874519322.

The spelling of 13856417 in words is "thirteen million, eight hundred fifty-six thousand, four hundred seventeen".