13856618 has 4 divisors (see below), whose sum is σ = 20784930. Its totient is φ = 6928308.

The previous prime is 13856617. The next prime is 13856629. The reversal of 13856618 is 81665831.

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 only one way, i.e., 13227769 + 628849 = 3637^2 + 793^2 .

It is not an unprimeable number, because it can be changed into a prime (13856617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3464153 + ... + 3464156.

Almost surely, 2^13856618 is an apocalyptic number.

13856618 is a deficient number, since it is larger than the sum of its proper divisors (6928312).

13856618 is an equidigital number, since it uses as much as digits as its factorization.

13856618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928311.

The product of its digits is 34560, while the sum is 38.

The square root of 13856618 is about 3722.4478505414. The cubic root of 13856618 is about 240.1886133062.

The spelling of 13856618 in words is "thirteen million, eight hundred fifty-six thousand, six hundred eighteen".