18342249 has 4 divisors (see below), whose sum is σ = 24456336. Its totient is φ = 12228164.

The previous prime is 18342223. The next prime is 18342251. The reversal of 18342249 is 94224381.

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 an emirpimes, since its reverse is a distinct semiprime: 94224381 = 3 ⋅31408127.

It is a cyclic number.

It is not a de Polignac number, because 18342249 - 2⁵ = 18342217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18342349) 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, 3057039 + ... + 3057044.

It is an arithmetic number, because the mean of its divisors is an integer number (6114084).

Almost surely, 2^18342249 is an apocalyptic number.

It is an amenable number.

18342249 is a deficient number, since it is larger than the sum of its proper divisors (6114087).

18342249 is an equidigital number, since it uses as much as digits as its factorization.

18342249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114086.

The product of its digits is 13824, while the sum is 33.

The square root of 18342249 is about 4282.7851919049. The cubic root of 18342249 is about 263.7247331725.

The spelling of 18342249 in words is "eighteen million, three hundred forty-two thousand, two hundred forty-nine".