18852228 has 18 divisors (see below), whose sum is σ = 47654334. Its totient is φ = 6284064.

The previous prime is 18852221. The next prime is 18852271. The reversal of 18852228 is 82225881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 3968064 = 3858^2 + 1992^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 523673 = 18852228 / (1 + 8 + 8 + 5 + 2 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 18852192 and 18852201.

It is not an unprimeable number, because it can be changed into a prime (18852221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 261801 + ... + 261872.

It is an arithmetic number, because the mean of its divisors is an integer number (2647463).

Almost surely, 2^18852228 is an apocalyptic number.

18852228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18852228 is an abundant number, since it is smaller than the sum of its proper divisors (28802106).

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

18852228 is a wasteful number, since it uses less digits than its factorization.

18852228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523683 (or 523678 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 18852228 is about 4341.9152456030. The cubic root of 18852228 is about 266.1465828603.

The spelling of 18852228 in words is "eighteen million, eight hundred fifty-two thousand, two hundred twenty-eight".