13866228 has 30 divisors (see below), whose sum is σ = 36249906. Its totient is φ = 4621968.

The previous prime is 13866221. The next prime is 13866233. The reversal of 13866228 is 82266831.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 116964 = 3708^2 + 342^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13866192 and 13866201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13866221) 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 9 ways as a sum of consecutive naturals, for example, 21075 + ... + 21722.

Almost surely, 2^13866228 is an apocalyptic number.

13866228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13866228 is an abundant number, since it is smaller than the sum of its proper divisors (22383678).

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

13866228 is a wasteful number, since it uses less digits than its factorization.

13866228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42813 (or 42802 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 13866228 is about 3723.7384440908. The cubic root of 13866228 is about 240.2441265917.

It can be divided in two parts, 138 and 66228, that added together give a palindrome (66366).

The spelling of 13866228 in words is "thirteen million, eight hundred sixty-six thousand, two hundred twenty-eight".