18015229 has 4 divisors (see below), whose sum is σ = 18024160. Its totient is φ = 18006300.

The previous prime is 18015197. The next prime is 18015253. The reversal of 18015229 is 92251081.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18015229 - 2⁵ = 18015197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18015197 and 18015206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18015259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154 + ... + 6004.

It is an arithmetic number, because the mean of its divisors is an integer number (4506040).

Almost surely, 2^18015229 is an apocalyptic number.

It is an amenable number.

18015229 is a deficient number, since it is larger than the sum of its proper divisors (8931).

18015229 is an equidigital number, since it uses as much as digits as its factorization.

18015229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8930.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18015229 is about 4244.4350625260. The cubic root of 18015229 is about 262.1480283473.

The spelling of 18015229 in words is "eighteen million, fifteen thousand, two hundred twenty-nine".