18009249 has 4 divisors (see below), whose sum is σ = 24012336. Its totient is φ = 12006164.

The previous prime is 18009227. The next prime is 18009259. The reversal of 18009249 is 94290081.

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: 94290081 = 3 ⋅31430027.

It is a cyclic number.

It is not a de Polignac number, because 18009249 - 2⁸ = 18008993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18009259) 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, 3001539 + ... + 3001544.

It is an arithmetic number, because the mean of its divisors is an integer number (6003084).

Almost surely, 2^18009249 is an apocalyptic number.

It is an amenable number.

18009249 is a deficient number, since it is larger than the sum of its proper divisors (6003087).

18009249 is an equidigital number, since it uses as much as digits as its factorization.

18009249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6003086.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18009249 is about 4243.7305522382. The cubic root of 18009249 is about 262.1190192111.

The spelling of 18009249 in words is "eighteen million, nine thousand, two hundred forty-nine".