18237228 has 12 divisors (see below), whose sum is σ = 42553560. Its totient is φ = 6079072.

The previous prime is 18237227. The next prime is 18237281. The reversal of 18237228 is 82273281.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18237221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759873 + ... + 759896.

It is an arithmetic number, because the mean of its divisors is an integer number (3546130).

Almost surely, 2^18237228 is an apocalyptic number.

It is an amenable number.

18237228 is an abundant number, since it is smaller than the sum of its proper divisors (24316332).

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

18237228 is a wasteful number, since it uses less digits than its factorization.

18237228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519776 (or 1519774 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 18237228 is about 4270.5067614980. The cubic root of 18237228 is about 263.2204390652.

The spelling of 18237228 in words is "eighteen million, two hundred thirty-seven thousand, two hundred twenty-eight".