13856663 has 4 divisors (see below), whose sum is σ = 13945080. Its totient is φ = 13768248.

The previous prime is 13856657. The next prime is 13856671. The reversal of 13856663 is 36665831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13856663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13856863) 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, 43973 + ... + 44286.

It is an arithmetic number, because the mean of its divisors is an integer number (3486270).

Almost surely, 2^13856663 is an apocalyptic number.

13856663 is a deficient number, since it is larger than the sum of its proper divisors (88417).

13856663 is an equidigital number, since it uses as much as digits as its factorization.

13856663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88416.

The product of its digits is 77760, while the sum is 38.

The square root of 13856663 is about 3722.4538949462. The cubic root of 13856663 is about 240.1888733137.

The spelling of 13856663 in words is "thirteen million, eight hundred fifty-six thousand, six hundred sixty-three".