13663859 has 4 divisors (see below), whose sum is σ = 14906040. Its totient is φ = 12421680.

The previous prime is 13663849. The next prime is 13663861. The reversal of 13663859 is 95836631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95836631 = 11 ⋅8712421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13663859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13663829) 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, 621074 + ... + 621095.

It is an arithmetic number, because the mean of its divisors is an integer number (3726510).

Almost surely, 2^13663859 is an apocalyptic number.

13663859 is a deficient number, since it is larger than the sum of its proper divisors (1242181).

13663859 is a wasteful number, since it uses less digits than its factorization.

13663859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242180.

The product of its digits is 116640, while the sum is 41.

The square root of 13663859 is about 3696.4657444646. The cubic root of 13663859 is about 239.0696563481.

It can be divided in two parts, 1366 and 3859, that added together give a palindrome (5225).

The spelling of 13663859 in words is "thirteen million, six hundred sixty-three thousand, eight hundred fifty-nine".