13856220 has 108 divisors (see below), whose sum is σ = 48923784. Its totient is φ = 3165120.

The previous prime is 13856177. The next prime is 13856221. The reversal of 13856220 is 2265831.

13856220 is a `hidden beast` number, since 1 + 38 + 5 + 622 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13856221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8035 + ... + 9605.

It is an arithmetic number, because the mean of its divisors is an integer number (452998).

Almost surely, 2^13856220 is an apocalyptic number.

13856220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13856220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24461892).

13856220 is an abundant number, since it is smaller than the sum of its proper divisors (35067564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13856220 is a wasteful number, since it uses less digits than its factorization.

13856220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 13856220 is about 3722.3943907114. The cubic root of 13856220 is about 240.1863136593.

The spelling of 13856220 in words is "thirteen million, eight hundred fifty-six thousand, two hundred twenty".