18228081 has 8 divisors (see below), whose sum is σ = 24702784. Its totient is φ = 11952720.

The previous prime is 18228073. The next prime is 18228083. The reversal of 18228081 is 18082281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18228081 - 2³ = 18228073 is a prime.

It is a super-2 number, since 2×18228081² = 664525873885122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18228083) 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 7 ways as a sum of consecutive naturals, for example, 49621 + ... + 49986.

It is an arithmetic number, because the mean of its divisors is an integer number (3087848).

Almost surely, 2^18228081 is an apocalyptic number.

It is an amenable number.

18228081 is a deficient number, since it is larger than the sum of its proper divisors (6474703).

18228081 is an equidigital number, since it uses as much as digits as its factorization.

18228081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99671.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18228081 is about 4269.4356769953. The cubic root of 18228081 is about 263.1764250664.

The spelling of 18228081 in words is "eighteen million, two hundred twenty-eight thousand, eighty-one".