18618229 has 8 divisors (see below), whose sum is σ = 21325248. Its totient is φ = 15923040.

The previous prime is 18618227. The next prime is 18618253. The reversal of 18618229 is 92281681.

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

It is not a de Polignac number, because 18618229 - 2¹ = 18618227 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618221) 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, 729 + ... + 6145.

It is an arithmetic number, because the mean of its divisors is an integer number (2665656).

Almost surely, 2^18618229 is an apocalyptic number.

It is an amenable number.

18618229 is a deficient number, since it is larger than the sum of its proper divisors (2707019).

18618229 is an equidigital number, since it uses as much as digits as its factorization.

18618229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915.

The product of its digits is 13824, while the sum is 37.

The square root of 18618229 is about 4314.8845871008. The cubic root of 18618229 is about 265.0408338642.

The spelling of 18618229 in words is "eighteen million, six hundred eighteen thousand, two hundred twenty-nine".