18328229 has 4 divisors (see below), whose sum is σ = 18449760. Its totient is φ = 18206700.

The previous prime is 18328201. The next prime is 18328231. The reversal of 18328229 is 92282381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18328229 - 2⁸ = 18327973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328249) 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 3 ways as a sum of consecutive naturals, for example, 60539 + ... + 60840.

It is an arithmetic number, because the mean of its divisors is an integer number (4612440).

Almost surely, 2^18328229 is an apocalyptic number.

It is an amenable number.

18328229 is a deficient number, since it is larger than the sum of its proper divisors (121531).

18328229 is a wasteful number, since it uses less digits than its factorization.

18328229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121530.

The product of its digits is 13824, while the sum is 35.

The square root of 18328229 is about 4281.1480936777. The cubic root of 18328229 is about 263.6575228901.

The spelling of 18328229 in words is "eighteen million, three hundred twenty-eight thousand, two hundred twenty-nine".