181839228 has 24 divisors (see below), whose sum is σ = 425655888. Its totient is φ = 60418176.

The previous prime is 181839221. The next prime is 181839233. The reversal of 181839228 is 822938181.

It is a self number, because there is not a number n which added to its sum of digits gives 181839228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181839221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20451 + ... + 27962.

It is an arithmetic number, because the mean of its divisors is an integer number (17735662).

Almost surely, 2^181839228 is an apocalyptic number.

It is an amenable number.

181839228 is an abundant number, since it is smaller than the sum of its proper divisors (243816660).

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

181839228 is a wasteful number, since it uses less digits than its factorization.

181839228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48733 (or 48731 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 181839228 is about 13484.7776399910. Note that the first 3 decimals coincide. The cubic root of 181839228 is about 566.5381929433.

The spelling of 181839228 in words is "one hundred eighty-one million, eight hundred thirty-nine thousand, two hundred twenty-eight".