18216133 has 8 divisors (see below), whose sum is σ = 20074208. Its totient is φ = 16423344.

The previous prime is 18216113. The next prime is 18216137. The reversal of 18216133 is 33161281.

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

It is a cyclic number.

It is not a de Polignac number, because 18216133 - 2⁵ = 18216101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18216098 and 18216107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18216137) 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 7 ways as a sum of consecutive naturals, for example, 15735 + ... + 16852.

It is an arithmetic number, because the mean of its divisors is an integer number (2509276).

Almost surely, 2^18216133 is an apocalyptic number.

18216133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18216133 is a deficient number, since it is larger than the sum of its proper divisors (1858075).

18216133 is a wasteful number, since it uses less digits than its factorization.

18216133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32643.

The product of its digits is 864, while the sum is 25.

The square root of 18216133 is about 4268.0361994716. The cubic root of 18216133 is about 263.1189108898.

The spelling of 18216133 in words is "eighteen million, two hundred sixteen thousand, one hundred thirty-three".